Friday

April 18, 2014

April 18, 2014

Number of results: 45,549

**Math**

What is the probability that the random variable has a value between 0.1 and 0.5? The random variable is .125.
*Sunday, March 7, 2010 at 9:14pm by Lyndse*

**probability**

A random experiment of tossing a die twice is performed. Random variable X on this sample space is defined to be the sum of two numbers turning up on the toss. Find the discrete probability distribution for the random variable X and compute the corresponding mean and standard ...
*Tuesday, October 11, 2011 at 6:04am by padma.c*

**probability**

Create the probability distribution for the random variable X (see other post), and sum probabilities of all outcomes greater than 7.
*Saturday, June 1, 2013 at 8:15pm by MathMate*

**Probability**

Suppose a random variable X has a cumulative distribution function given by F(a) = {0 for a<0, 1/2 for 0<=a<1, 3/5 for 1<=a<2, 4/5 for 2<=a<3, 9/10 for 3<=a<3.5, 1 for 3.5<=a. a. Find the probability mass function for X. b. Find the probability ...
*Wednesday, January 21, 2009 at 8:34pm by Julie*

**Probability**

Suppose a random variable X has a cumulative distribution function given by F(a) = {0 for a<0, 1/2 for 0<=a<1, 3/5 for 1<=a<2, 4/5 for 2<=a<3, 9/10 for 3<=a<3.5, 1 for 3.5<=a. a. Find the probability mass function for X. b. Find the probability ...
*Wednesday, January 21, 2009 at 8:40pm by Julie*

**Math**

Suppose you have binomial trials for which the probability of success on each trial is p and the probability of failure is q= 1-p. Let k be a fixed whole number greater than or equal to 1. Let n be the number of the trial on which the kth success occurs. This means that the ...
*Tuesday, May 22, 2012 at 10:15am by Chad*

**Math**

Expand Your Knowledge: Negative Binomial Distribution Suppose you have binomial trials for which the probability of success on each trial is p and the probability of failure is q= 1-p. Let k be a fixed whole number greater than or equal to 1. Let n be the number of the trial ...
*Monday, May 21, 2012 at 9:40pm by Billy*

**Math**

Suppose a baseball player had 211 hits in a season. In the given probability distribution, the random variable X represents the number of hits the player obtained in the game. x P(x) 0 0.1879 1 0.4106 2 0.2157 3 0.1174 4 0.0624 5 0.0060 a.) Compute and interpret the mean of ...
*Tuesday, November 26, 2013 at 2:01pm by Amanda*

**math**

a fair coin is flipped 5 times the random variable is x is defined to be the number of heads that are observed identify the probability mass function of the random variable x. x P(x)
*Wednesday, October 3, 2012 at 9:18am by virginia*

**Statistics**

x is a random variable with the probability function: f(X) = x/6 for x = 1, 2 or 3 the expected value of X is?
*Thursday, October 8, 2009 at 4:07pm by Shellie*

**Math**

What is the variability of this "random variable"? (.125 is a specific value rather than a random variable.) More information needed.
*Sunday, March 7, 2010 at 9:14pm by PsyDAG*

**Statistics and Probability**

Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the mean value u = 5. Be sure to define any random ...
*Sunday, March 27, 2011 at 1:57pm by Adam *

**Statistics and Probability**

Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the mean value u = 5. Be sure to define any random ...
*Saturday, March 26, 2011 at 12:23am by Adam HELP PLEASEEE*

**math**

let the random variable x denote the number of girls in a five-child family. if the probability of a female birth is .5 find the probability of 0,1,2,3,4, and 5 girls in a five-child family. construct the binomial distribution and draw the histogram associated with the ...
*Thursday, April 23, 2009 at 4:36pm by miranda*

**statistics**

two dices are tossed once. let the random variable be t he sum of the up faces on the dice. A). find and graph the probability distribution of the random variable. and b) calculate the mean (or expectation) of this distribution
*Sunday, May 22, 2011 at 4:54pm by sharik*

**arithmetic**

Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 = 1/36 Consider a ...
*Saturday, June 1, 2013 at 8:15pm by Anonymous*

**Economics/Math**

1. Assume that q and z are two random variables that are perfectly positively correlated. q takes the value of 20 with probability 0.5 and the value of zero with probability 0.5, while z takes the value of 10 with probability 0.5 and the value of zero with probability 0.5. ...
*Saturday, December 5, 2009 at 6:39am by Susan*

**probability**

A fair coin is flipped independently until the first Heads is observed. Let K be the number of Tails observed before the first Heads (note that K is a random variable). For k=0,1,2,…,K, let Xk be a continuous random variable that is uniform over the interval [0,3]. The Xk's ...
*Friday, March 28, 2014 at 12:36pm by JuanPro*

**Probability**

For each of the following statements, determine whether it is true (meaning, always true) or false (meaning, not always true). Here, we assume all random variables are discrete, and that all expectations are well-defined and finite. Let X and Y be two binomial random variables...
*Tuesday, March 4, 2014 at 11:37am by qwerty*

**math 115**

Let x be a continuous random variable that follows a normal distribution with a mean of 200 and a standard deviation 25. Find the value of x so that the area under the normal curve between ì and x is approximately 0.4798 and the value of x is greater than ì.
*Tuesday, November 19, 2013 at 10:45pm by louise*

**Economics/Statistics**

1. Assume that q and z are two random variables that are perfectly positively correlated. q takes the value of 20 with probability 0.5 and the value of zero with probability 0.5, while z takes the value of 10 with probability 0.5 and the value of zero with probability 0.5. ...
*Sunday, December 6, 2009 at 3:53am by Susan*

**statistics**

In a certain region, the mean annual salary for plumbers is $51,000. Let x be a random variable that represents a plumber's salary. Assume the standard deviation is $1300. If a random sample of 100 plumbers is selected, what is the probability that the sample mean is greater ...
*Monday, February 25, 2013 at 11:14am by katie*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
*Monday, April 18, 2011 at 9:01pm by Katie*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 45.
*Monday, April 18, 2011 at 9:02pm by Katie*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
*Wednesday, October 31, 2012 at 10:05pm by Anonymous*

**statistics**

the random variable x is known to be uniformly distributed between 70 and 90. the probability of x having a value between 80 to 95 is
*Tuesday, December 6, 2011 at 8:20pm by Anonymous*

**Data Management**

A random variable X is defined as the number of heads observed when a coin is tossed 4 times. Make a chart that shows the probability distribution for X. What is the expected value?
*Tuesday, January 21, 2014 at 8:28pm by Alejandro*

**Statistics**

1. The sociologist surveyed the households in a small town. The random variable X represents the number of dependent children in the households. The following is the probability distribution of X: X 0 1 2 3 4 P(X) 0.07 0.20 0.38 k 0.13 (a) Find the missing probability value of...
*Wednesday, June 1, 2011 at 11:33am by LadyJustice85*

**Maths**

1)A two-figure number is written down at random. Find the probability that a)the number is greater than 44 b)the number is less than 100 2)A letter is picked at random from the english alphabet. Find the probability that a)the letter is a vowel (my answer=5/26) b)the letter ...
*Monday, January 28, 2008 at 2:59pm by Anonymous*

**STATISTICS**

Consider a binomial random variable where the number of trials is 12 and the probability of success on each trial is 0.25. Find the mean and standard deviation of this random variable. I have a mean of 4 and a standard deviation of 2.25 is this correct
*Thursday, June 10, 2010 at 6:12pm by John*

**probability April-005**

X is a random variable following binomial distribution with mean 2.4 and variance 1.44 find
*Thursday, April 18, 2013 at 11:20am by probability*

**probability April-005**

Q.4. X is a random variable following binomial distribution with mean 2.4 and variance 1.44 find P[X>5]
*Thursday, April 18, 2013 at 11:20am by probability*

**probability April-005**

X is a random variable following binomial distribution with mean 2.4 and variance 1.44 find P[X>5]
*Thursday, April 18, 2013 at 11:20am by probability*

**Probability**

7. The random variable X is distributed normally with a mean of 12.46 and variance of 13.11. You collect a random sample of size 37. a. What is the probability that your sample mean is between 12 and 13? b. What is the probability that a single observation is between 12 and 13...
*Sunday, October 27, 2013 at 6:23pm by John*

**Statistics-Probability**

Consider a binomial random variable X with parameters(4,1/2). Find the conditional probability mass function of X given that X is odd
*Wednesday, January 25, 2012 at 3:28am by sand*

**stats**

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and 4. (a) Find the ...
*Wednesday, November 5, 2008 at 8:40pm by Mischa*

**Statistics**

1. In thinking about doing statistical analysis, the sample mean should be interpreted as: A.)a constant value that is equal to the population mean. B.) a constant value that is approximately equal to the population mean. C.) a random variable that is approximately equal to ...
*Tuesday, May 3, 2011 at 7:31pm by Sara*

**Finite**

Assume that the box contains balls numbered from 1 through 28, and that 3 are selected. A random variable X is defined as 1 times the number of odd balls selected, plus 2 times the number of even. How many different values are possible for the random variable X? I know that is...
*Monday, October 8, 2012 at 11:00pm by Sam*

**Probability and statistics**

8. A random variable X takes exactly the 5 values 1, 2,3,4,5, all with same probability. The mean of X is Choose one answer a. 2.5 b. 15 c. 7.5 d. 3
*Friday, March 2, 2012 at 3:25am by Arun*

**Math**

On the leeward side of the island of Oahu, in the small village of Nanakuli, about 80% of the residents are of Hawaiian ancestry. Let n = 1,2,3.... represent the number of people you must meet until you encounter the first person of Hawaiian ancestry in the village of ...
*Monday, May 21, 2012 at 7:32pm by Billy*

**Math**

On the leeward side of the island of Oahu, in the small village of Nanakuli, about 80% of the residents are of Hawaiian ancestry. Let n = 1,2,3.... represent the number of people you must meet until you encounter the first person of Hawaiian ancestry in the village of ...
*Tuesday, May 22, 2012 at 10:16am by Chad*

**math 3**

A bag contains 4 yellow, 2 red, and 6 green marbles. Two marbles are drawn. The first is replaced before the second is drawn. A random variable assigns the number of red marbles to each outcome. Calculate the expected value of the random variable
*Tuesday, February 11, 2014 at 1:12pm by Jamar*

**statistics**

Suppose that a random variable Y has a probability density function given by f(y) = ( ky 3 e y=2 ; y > 0 0; elsewhere: Find the value of k that makes f(y) a density function.
*Monday, April 16, 2012 at 12:00pm by Anonymous*

**Elementary statistics **

Nine apples, four of which are rotten, are in a refrigerator. Three apples are randomly selected without replacement. Let the random variable x represent the number chosen that are rotten. Construct a table describing the probability distribution, then find the mean and ...
*Wednesday, February 29, 2012 at 12:35am by Rose Bud*

**Math **

Normal distributions model (some) continuous random variables. Strictly, a Normal random variable should be capable of assuming any value on the real line, though this requirement is often waived in practice. For example, height at a given age for a given gender in a given ...
*Thursday, January 14, 2010 at 6:58pm by Damon*

**statistics**

Let a random variable be distributed as shown below X=x : 0,1,2,3,4,5,6 P(x): .1 .09 .2 .15 .16 .2 (a) Find the probability p(6) (b) Find the probability P(3< X < 5) (c) Find the probability P(X < 4) (d) Find the probability P(X > 2)
*Saturday, September 17, 2011 at 11:01am by kim wallace*

**statistics**

Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?
*Sunday, May 12, 2013 at 11:25am by erin*

**statistics**

Women’s heights are normally distributed with a mean of 162 cm and standard deviation of 16 cm. a. Define an random variable, X, and describe its full distribution including the mean and variance. b. What percentage of heights are greater than 180 cm ? c. What height is at the...
*Sunday, December 4, 2011 at 8:54pm by Jasmine*

**Math/Probability**

The random variable X has a log-normal distribution, when the mean of ln(X) = 5.45 and variance of ln(X) = 0.334, what is the probability that X >139.76?
*Sunday, October 27, 2013 at 6:50pm by Sam*

**Math- Statistics**

A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. * a. This sample of 36 has a mean value of , which belongs to a sampling distribution. Find the shape of this sampling distribution. * b. Find the ...
*Tuesday, February 8, 2011 at 9:14pm by Tammy*

**math**

A person’s blood glucose level and diabetesare closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. After a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean &#...
*Monday, November 29, 2010 at 11:31pm by Kris*

**probability**

Alice and Bob each choose at random a real number between zero and one. We assume that the pair of numbers is chosen according to the uniform probability law on the unit square, so that the probability of an event is equal to its area. We define the following events: A = {The ...
*Friday, February 7, 2014 at 4:11pm by JuanPro*

**statistics**

Consider a normal distribution with mean 30 and standard deviation 6. What is the probability a value selected at random from this distribution is greater than 30? (Round your answer to two decimal places.)
*Friday, October 22, 2010 at 11:50pm by Anonymous*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 24 and a standard deviation of 7. Find the probability that x assumes a value between 27.5 and 59.0. Use Table IV in Appendix C to compute the probabilities. Round your answer to four decimal ...
*Monday, April 18, 2011 at 9:02pm by Katie*

**Statistics**

17. A normal distribution has a mean of 50 and a standard deviation of 4. a. Compute the probability of a value between 44.0 and 55.0. b. Compute the probability of a value greater than 55.0. c. Compute the probability of a value between 52.0 and 55.0.
*Monday, July 18, 2011 at 6:57pm by Anonymous*

**math**

A random variable x has a probability distribution. How to calculate E(1/(X+1))?
*Wednesday, August 24, 2011 at 7:17pm by Mahalakshmi*

**maths probability**

The lifetime X of a bulb is a random variable with the probability density function: f(x)=6[0.25-(x-1.5)^2] when 1<=x<=2 0 otherwise X is measured in multiples of 1000 hrs. What is the probability that none of the three bulbs in a traffic signal have to be replaced in ...
*Monday, January 27, 2014 at 12:38am by rupesh painkra*

**math**

Four well-defined social classes (1=low and 4=high) exist in a country. If X is a random variable giving the social class of the son of a father from social class 1, the distribution of X is as follows: we have a small chart that has son's class, X and a 1,2,3,4 next to it ...
*Wednesday, December 1, 2010 at 9:44am by m*

**DISCRETE MATH**

Temp is a temporary variable. Lets see. It reads the first value, stores it in temp1, then it reads the next variable, tests it to see if it is greater than the first variable, if so, it replaces it, if not it reads the next data, and so on. It appears to me it returns the ...
*Monday, November 17, 2008 at 8:07am by bobpursley*

**Probabilty**

Biased coin has a 0.4 probability of landing on tails. The random variable x, based on a single toss of the coin, is defined as follows: x=0 if heads appears; x=1 if tails appears. What Is the mean value of X? Is it . 0.3 .4 .6 .5 .7
*Wednesday, November 28, 2012 at 12:00pm by Gilbert*

**PRE-CALC**

A biased coin has a 0.4 probability of landing on tails. The random variable X, based on a single toss of the coin, is defined as follows: X = 0 if heads appears; X = 1 if tails appears. What is the mean value of X? A) 0.7 B) 0.5 C) 0.4 D) 0.3 E) 0.6
*Monday, March 24, 2014 at 9:59am by Anonymous*

**statistics**

A random sample of n= 16 scores is selected from a normal distribution with a mean of u=50 and a standard deviation of q=10. A. what is th probability that the sample mean will have a value between 45 and 55? B. What is the probability that a sample mean will have a value ...
*Wednesday, May 4, 2011 at 12:22pm by Zelinka*

**statistics**

The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable. Find the probability that one student selected at random is older than 23. Find the probability that the mean age of a group of 16 ...
*Friday, June 11, 2010 at 9:03pm by DezShonna K*

**social psy **

I want to utilize a true experimental design to study the effects of classical music exposure on the cognitive development of newborns. a- What is an independent variable? b- What is a dependent variable? c-What is random assignment? d-Why is random assignment important? e-...
*Monday, October 3, 2011 at 2:24pm by deb*

**MATH**

(5 pts) The length, X, of a fish from a particular mountain lake in Idaho is normally distributed with \mu = 9.7 inches and \sigma = 1.7 inches. (a) Is X a discrete or continuous random variable? (Type: DISCRETE or CONTINUOUS) ANSWER: (b) Write the event ''a fish chosen has a ...
*Wednesday, February 5, 2014 at 2:03am by Violet*

**statistics**

A random variable may assume any value between 10 and 50 with equal likelihoods. (Uniform distribution) Determine the following values for this probability distribution: a) b) c) f(x) = d) P(x < 25) e) P(x > 15) f) P( 12 < x < 30)
*Saturday, October 23, 2010 at 4:35pm by Anonymous*

**statistics**

A random variable x has a following probability distribution. x: 0 1 2 3 P(X=x) 1/6 1/2 1/5 2/15 How to calculate E(1/(X+1))?
*Wednesday, August 24, 2011 at 7:31pm by Mahalakshmi*

**math**

A random variable x has a following probability distribution. x: 0 1 2 3 P(X=x): 1/6 1/2 1/5 2/15 How to calculate E(1/(X+1))?
*Wednesday, August 24, 2011 at 7:48pm by Mahalakshmi*

**math,correction**

Find expected value for the random variable. its suppost to be a table 6 X 2 i used the .... to represent separation z.....3......6.....9.....12.......15 p(z)..0.14..0.29..0.36..0.11...0.10 So what i did is i said e(x) = 3 (0.14)+ 6(0.29)+ etc to all the rest. and my result ...
*Friday, July 13, 2007 at 7:46pm by student*

**math**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*Tuesday, August 11, 2009 at 4:11pm by Anonymous*

**math157**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*Wednesday, October 21, 2009 at 9:34pm by jason*

**Math**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.p and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value for...
*Tuesday, March 30, 2010 at 12:12am by Iris*

**MATH**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*Thursday, April 1, 2010 at 10:59am by Tyga*

**Math**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3,with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value for...
*Tuesday, May 18, 2010 at 12:43pm by Felicia*

**statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*Monday, June 10, 2013 at 6:58pm by Jade*

**math**

You roll a number cube numbered from 1 to 6. what is the probability you roll a number divisible by 4? Answer: I think 2/6 or 1/3 A number from 16 to 23 is drawn at random. what is the probability you draw a number greater than 18? Answer 5/7 A jar contains 21 brown, 4 violet...
*Thursday, March 13, 2014 at 12:35pm by Anonymous*

**Stats**

The Geometric distribution is used when we want to ﬁnd the probability of performing a sequence of trials with X “failures” before the ﬁrst “success”, where a “success” occurs with some probability p. We can denote such a random variable as X ∼ Geo(p). The ...
*Monday, September 30, 2013 at 9:05pm by Becca*

**MATH Prob.**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*Wednesday, August 12, 2009 at 12:01am by Twg*

**math/graphing**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...
*Thursday, October 22, 2009 at 12:42am by jason*

**Stats**

A "random variable" is a technical term: it does not mean a variable that is "random" in the colloquial sense. The definitions above are taken from the "variance" and "covariance" entries in Wikipedia, but can be verified at any site containing a statistical glossary, e.g. ...
*Monday, September 22, 2008 at 3:39pm by David Q*

**statistics**

government data assign a single case or each death that occurs in the u.s. the data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular disease, and 0.22 that i was due to cancer. Suppose a docote checked the cause of death of 2 randomly ...
*Monday, October 24, 2011 at 2:12pm by josh*

**ap stats need help**

Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0¡ÜX¡Ü0.4) b.P(0.4¡ÜX¡Ü1) c.P(0.3¡ÜX0.5) d.P(0.3(<X<0.5) e.P(0.226¡ÜX¡Ü0.713) f.What ...
*Tuesday, March 10, 2009 at 9:55pm by chris*

**statistics**

True or False: A zero population correlation coefficient between a pair of random variable means that there is no linear relationship between the random variable.
*Monday, February 8, 2010 at 8:07pm by iyra*

**Statistics (binomial random variable)**

Let x be a binomial random variable with n = 10 and p = .4 Find the values. P (x›4) P (x≤4) I could really use some examples to help me get started and understand it. Thanks
*Saturday, April 23, 2011 at 11:10pm by sonney32*

**Statistics**

A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution that is approximately ...
*Sunday, June 20, 2010 at 11:13am by Alex*

**telemarketing**

A telemarketer with B2B Communications has a 20 percent historical probability of making a sale during a shift where 100 calls were made. Assign a random variable x, where the value of x is equal to the number of sales made during the shift. Describe the probability ...
*Saturday, July 23, 2011 at 1:02pm by tom*

**Statistics**

n order to study the amounts owed to the city council, a city clerk takes a random sample of 16 files from a cabinet containing a large number of delinquent accounts and finds the average amount owed to the city to be $231. It has been claimed that the true mean amount owed on...
*Tuesday, May 24, 2011 at 8:34am by Dick*

**Statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*Saturday, March 10, 2012 at 4:30pm by Roshelle*

**check math**

If x is a binomial random variable, calculate the probability of x for each case. n=4, x=1, p=0.3 answer 0.4116
*Sunday, June 2, 2013 at 12:00am by Sue*

**math check**

x is a binomial random variable. (Give your answers correct to three decimal places.) (e) Calculate the probability of x for: n = 3, x = 1, p = 0.45 P(x) = .I got 0.41 (f) Calculate the probability of x for: n = 6, x = 6, p = 0.25 P(x) = I got 1.50
*Friday, June 7, 2013 at 8:31pm by Gayle 57*

**probability**

t the discrete random variable X be uniform on {0,1,2} and let the discrete random variable Y be uniform on {3,4}. Assume that X and Y are independent. Find the PMF of X+Y using convolution. Determine the values of the constants a, b, c, and d that appear in the following ...
*Friday, March 28, 2014 at 12:35pm by JuanPro*

**Statistics **

Suppose that the birth weight of newborn babies in the U.S is normally distributed with a mean of 7 pounds and a standard deviation of 1.6 pounds. Let the random variable X be the birth weight of a randomly selected record of live birth. a) What is the distribution of X? b) ...
*Friday, March 2, 2012 at 9:17am by Angel*

**statistic**

The random variable x represents the number of boys in a family with three children. Assuming that births of boys and girls are equally likely, find the mean and standard deviation for the random variable x.
*Tuesday, August 20, 2013 at 4:35pm by Kim*

**Finite Math**

:
Four cards are drawn without replacement from a well shuffled standard deck of cards. Let X be the number of aces drawn. 12. What are the possible values of the random variable X? Write them in increasing order as a set using roster (or list) notation. 13. Sketch a ...
*Saturday, December 14, 2013 at 8:42pm by Janice*

**college**

Four hundred people apply for three jobs. 130 of the applicants are women. (a) If three persons are selected at random, what is the probability that all are women? (b) If three persons are selected at random, what is the probability that two are women? (c)If three persons are ...
*Thursday, March 25, 2010 at 9:36pm by kay*

**Math-Probability**

Consider a collection of biased coins, each showing Heads with probability and Tails with probability , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability mass ...
*Sunday, January 22, 2012 at 4:45am by sand*

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...
*Sunday, January 22, 2012 at 4:45am by sand*

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...
*Sunday, January 22, 2012 at 11:59pm by sand*

**Math-Probability**

Consider a collection of n biased coins, each showing Heads with probability p and Tails with probability 1-p , independently of the others. The coins are tossed and all coins showing Heads are collected together and tossed again. Write down an expression for the probability ...
*Tuesday, January 24, 2012 at 1:15am by sand*

**maths-probabilty**

The probabilities for drawing a red ball from a particular bag are: P(red|bag1) = 3/5 P(red|bag2) = 5/9 The conditional probability that a variable X takes some value given that another variable Y takes some value, denoted as P(X|Y) is related to the joint probability as ...
*Wednesday, March 20, 2013 at 1:07pm by Count Iblis*

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