Tuesday

September 16, 2014

September 16, 2014

Number of results: 30,572

**Probability/Statistics**

A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that there's 10 questions, each ...
*July 11, 2009 by Amy*

**Math check**

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.37 0.09 0.05 0.14 0.35 (a) Find the mean of the number ...
*June 2, 2013 by Nora 55*

**Calculus; Product Rule**

Find the value of dy/dx for the given value of x. a) y = (1 - 2x)(1 + 2x), x = 1/2 y' = 2(1 + 2x) + 2(1 - 2x) y' = 2 + 4x + 2 - 4x y' = 4 How do I find the derivative at x = 1/2 if there is no x variable to substitute the x value with? According to my textbook, the answer is -...
*April 29, 2008 by Anonymous*

**math**

If two people are selected at random, what is the probability that they were both born in May?
*June 9, 2011 by CC*

**statistics**

If a card is drawn at random from a deck of 52, what is the probability that it is an ace or a heart?
*September 15, 2011 by Kate*

**math**

What is the probability that one selected at random will read between -1.2 and 1.3 knots?
*October 12, 2011 by Cindy*

**algebra**

What is the probability that a month picked at random will have 31 days? A.5/12 B.4/12 C.7/12 D.8/12 I think it is C...?
*March 18, 2013 by Cassie*

**math **

Find the probability between 42 and 48 speeders in a random sample of 100
*May 2, 2013 by john jones*

**probability**

A bowl contains only red marbles, blue marbles and green marbles. The probability of selecting a red marble from the bowl is 3/13. The probability of selecting a blue marble from the bowl is 2/5. There are fewer than 100 marbles in the bowl. What is the probability of ...
*November 15, 2012 by chocolateman*

**math**

A bag contains 3 red, 5 black and 5 blue marbles. Four marbles are selected at random without replacement: - the probability that all 4 are black? -the probability that exactly two are blue and none are red?
*January 25, 2011 by Sandy*

**statistics**

Based on a random sample of 25 units of lawnmowers, the average weight is 102 lbs., and the sample standard deviation is 10 lbs. We would like to decide if there is enough evidence to establish that the average weight for the population of lawnmowers is greater than 100 lbs. ...
*October 5, 2010 by julie*

**Algebra! Plz help~!**

You have the numbers 1-25 written on slips of paper. If you choose a slip at random, what is the probability that you will select a number that is divisible by 5? You have the numbers 1-24 written on slips of paper. If you choose a slip at random, what is the probability that ...
*May 21, 2014 by :)*

**math probability **

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.
*February 28, 2011 by Sam*

**math**

John has 2 coins, one fair and the other unbalanced so that the probability of its coming up heads is 2/3. He picks one of the coins at random, tosses it, and it comes up heads. What is the probability that he picked the unbalanced coin?
*July 7, 2013 by Annonymous*

**stats please help test tom**

When a computerized generator is used to generate random digits, the proability that any particular digit in the set {0,1,2, . . .,9} is generated on any individual trial is 1/10-0.1. suppose that we are generating digits one at a time and are interested in tracking ...
*January 24, 2007 by david*

**Math**

If q is 20 percent greater than p, and p is 35 percent greater than 2,000, what is the value of q - p?
*August 22, 2011 by Amy*

**probability **

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white
*February 27, 2011 by sam*

**Finance**

Your trust fund will pay you $100.000 in six years when you turn 25. A shady institute has encourage you to sign over in exchange of cash today. Would you prefer a 8% or 10% discount rate to determine value of lump sum payment ? A. Use 8% the lump sum is $62, 741 is greater ...
*January 21, 2014 by Anthony*

**Basic Statistics **

A population of 300 voters contains 147 Republicans, 135 Democrats, and 18 independents and members of other parties. A simple random sample of 30 voters will be drawn from this population. Consider repeatedly drawing simple random samples of size 30 from the population (...
*July 24, 2011 by mike*

**MATH**

Determine whether the situation calls for a discrete or continuous random variable. The braking time of a car Is it discrete?
*September 8, 2009 by Jalynn*

**statitics**

Let X be a Poisson random variable with mean µ = 2.5. Use Table 2 in Appendix I to calculate these probabilities: a. P (X ≥ 5) b. P(X < 6) c. P(X = 2) d. P(1 ≤ X ≤ 4)
*October 17, 2010 by Anonymous*

**statistics**

A random variable X is best described by a continuous uniform distribution from 20 to 45 inclusive. The standard deviation of this distribution is approximately
*August 16, 2011 by Anonymous*

**probability**

A bag contains 3 red marbles, 3 blue marbles and 3 yellow marbles. Which of the following methods of selecting 2 marbles will have the greater probability of choosing 2 red marbles?
*March 29, 2014 by Matt*

**MATH**

A basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jonas picks a fruit at random and does not replace it. Then Beth picks a fruit at random. What is the probability that Jonas gets a peach and Beth gets an apple?
*April 11, 2013 by .*

**Math**

A basket contains the following pieces of fruit: 3 apples 2 oranges, 2 bannans, 2 pears, and 5 peaches. Jonas picks a fruit at random and does not replace it. Then beth picks a fruit at random. What is the probability that jonas gets a peach and beth gets an apple?
*April 21, 2014 by Alexander*

**Probability**

Erin's CD changer holds 6 compact disks. Justin uses the random function on to play all the songs randomly. If each of the disks on the changer holds 10 songs, what is the probability has favorite song will be first? If I am getting the hang of this, it's 1/2160 Please help.
*March 30, 2008 by Ktowns*

**Math**

A basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jack picks a fruit at random and does not replace it. Then Bethany picks a fruit at random. What is the probability that Jack gets a peach and Bethany gets an orange? A. 10...
*March 5, 2014 by Anonymous*

**Math**

A basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jack picks a fruit at random and does not replace it. Then Bethany picks a fruit at random. What is the probability that Jack gets a peach and Bethany gets an orange? A. 10...
*March 5, 2014 by Anonymous*

**Probabilities**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 1, 2013 by Anna*

**maths**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 1, 2013 by stranger*

**maths**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 2, 2013 by stranger*

**probability**

among the exames in the examination 30%, 35% & 45% failed in statistics, in maths, & in atleast one of the subjects respectively. one student is selected at random. find the probability that: (a)he has failed in maths, (b)he passed in statistiics if it is known that he has ...
*October 27, 2010 by hhhh*

**Statistics**

The average teacher's salary in North Dakota is $41,027. Assume a normal distribution with standard deviation of $5200. A. what is the probability that a randomly selected teachers salary is less than 40,000? B. What is the probability that the mean for a sample of 80 teachers...
*October 21, 2013 by Jasmin*

**Chemistry(Please check)**

1)For electrolyte solutions, the _____ the concentration of the electrolyte and the ____ the ion charges, then the ____ the ion-pairing. a) lower, smaller, greater b) higher, smaller, smaller c) higher, greater, greater d) lower, greater, smaller e) lower, greater, greater I ...
*February 10, 2012 by Hannah*

**Math**

A class is made up of 10 boys and 2 girls. Half of the boys wear glasses. A student is selected at random from the class. What is the probability that the student is a boy with glasses? My Question is, I don't know how to do Probability.
*April 27, 2009 by Emily*

**statistics**

A sample of 36 females is taken. What is the probability that the mean height of these women is shorter than 64 inches if we know the height for all American females is N(63,3^2)? What is the probability that a random woman is shorter than 64 inches?
*April 3, 2011 by Cori*

**Math-Probability**

An urn contains four red balls and three white balls. A sample of 2 balls is selected at random from the urn. What is the probability that at least one of the balls is red?
*March 16, 2012 by Emma*

**Statistics in Psychology**

A researcher finds that the correlation between variable A and variable B is r= 5 1.20. She also finds that the correlation between variable C and variable B is r= 5 2.40. Which relationship is scientifically more useful and by how much?
*February 10, 2014 by Annie*

**statistics**

a random variable having a normal distribution with σ = 0.05 ounce, find the mean such that only 1% of the bags contain less than 8 ounces of potato chips.
*March 22, 2012 by Anonymous*

**Math**

When solving absolute value inqualities, if it's less than it's "and", if it's greater than it's "or". what about less than or equal to or greater than or equal to?
*January 19, 2009 by Emeralda*

**Stats**

What is the probability that a simple random sample of 56 special orders will provide an estimate of the population proportion of special orders specifying the color black that is within plus or minus .05 of the actual population proportion,assuming p = .36? In other words, ...
*May 4, 2010 by Anon*

**math**

You are going to roll two dice. Let the variable x = the sum of the numbers rolled. What is the probability that x = 9?
*May 16, 2013 by tariq*

**college Psychology**

I am having trouble describing the interaction (How does effect of one Independent variable depend on level of other independent variable and why?) My 1st independent variable is Type of Stimulus: with 2 levels pictures and words. My 2nd independent variable is Type of Content...
*March 14, 2010 by James*

**STATISTICS**

The number of boxes of girl scout cookies sold by each of the girl scout in a city has a distribution which is approximately normal with a mean=75 boxes and a standard deviation=30 boxes.... 1.) find the probability that scout chosen at random sold between 60 and 90 boxes. 2...
*August 10, 2011 by Mason*

**probability and statistics**

the average age for licensed drivers in the country is u=40.3 years with a standard deviation of o= 13.2 years. a. a researcher obtained a random sample of n=16 parking tickets and computed an average age of m=38.9 years for the drivers. is it reasonable to conclude that this ...
*January 6, 2012 by kiera*

**math - probability**

Assume that there are 7 different issues of Newsweek, 8 different issues of Time, and 4 different issues of Sports Illustrated, including the December 1st issue, on the rack. You choose 4 of them at random. (1) What is the probability that you choose 2 issues of Newsweek and 2...
*February 20, 2012 by victoria*

**Math-probability**

A simple dartboard has three areas… the main board has a radius of 11 inches, there is a circle with a radius of 5 inches, and the bullseye has a radius of 2 inches. What is the probability of a random dart landing inside the bullseye? Round to the nearest thousandth. I ...
*July 22, 2011 by Jen*

**probability**

2.The daily production from a car factory=3 different models-A,B,C which are in two different colours-R and S. Daily the factory produces 1600 model A cars,800 of model B and 600 of model C. Overall,40% of the cars are of colour R,60% of colour S.60% of of the model A cars are...
*May 18, 2008 by Anonymous*

**Math**

A jar contains 5 red marbles and 3 green marbles. A marble is drawn at random and not replaced. A second marble is then drawn from the jar. Find the probability that both marbles are the same color. I figured out that the probability that both marbles are red is 20/56 and the ...
*May 28, 2014 by S8*

**binomial random variables**

compute the probability of x successes in the n independent trials of the expirement. n=10 p=0.4 x=3
*March 1, 2009 by angie*

**Biostatistics**

if we select a birth at random, what is the probability the mother is 19 years of age or younger
*March 23, 2010 by Brenda*

**math**

Find each probability for choosing a letter at random from the word MATHEMATICS. P(vowel) 4/11?
*November 3, 2010 by Anonymous*

**math**

Page 9 of 9 What is the probability that a point chosen at random on segment PQ will be between -1 and 3? -5 through 5
*April 1, 2011 by sha*

**maths**

A 3 digit natural number is selected at random .Find the probability that it is divisible by 2 but not by 3?
*January 14, 2013 by Anonymous*

**Math**

Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
*July 10, 2013 by Celina*

**Maths**

Approximate the probability that the sum of the 16 independent uniform (0,1) random variables exceeds 10.
*August 19, 2014 by Nithi*

**Maths**

Approximate the probability that the sum of the 16 independent uniform (0,1) random variables exceeds 10.
*August 20, 2014 by Chit*

**Computer Science**

Suppose X is a random variable and Y = aX + b is a linear function of X. Show that the correlation of X and Y is -1 if a < 0. cor(X,Y) = cov(X,V)/ sqrt(var(X)*var(Y))
*October 28, 2013 by Jerry*

**Computer Science (MATLAB)**

Given a vector of values of zeros and ones such as [1 0 1 0 0 0 1 0] I'm asked to, given a probability provided by the user, use that probability to change the values in the vector using that probability. For example given the vector [0 1 0 0 0 1 0 0 0 1] and probability .2 ...
*October 18, 2011 by Jhon*

** Math Urgent**

17. A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. a. Find the theoretical probability of selecting a pink rubber band. b. Find the ...
*April 17, 2013 by Anonymous*

**Pre-cal**

What is the probability of getting an even number on a single roll of a number cube if you roll a 3 or greater. My answer: is 1/3 because there are only two numbers that are even and greater than 3 on the number cube. Teacher marked this as wrong. How did I mess this one up?
*January 3, 2009 by Lucy*

**algebra II**

find the expected value of the prize value $0 $1 $5 $20 probability 0.9359 0.05 0.01 0.003
*March 24, 2009 by chrissy*

**stat probability**

According to an Internet posting, 65% of adults enjoy drinking soda. Choose a group of 12 adults at random. The probability that none of them enjoy drinking soda is?
*April 8, 2013 by Lynn*

**Advanced Math**

A set of 750 values has a normal distribution with a mean of 12.5 and a standard deviation of 0.36. A. What percent of the data is between 12.25 and 12.75? ANSWER: 51.6% B. Find the interval about the mean within wich 45% of the data lie. ANSWER: 12.28-12.72 C. Find the ...
*August 11, 2009 by Patrick*

**Government Us**

Compared to Supreme Court nominations, those for the lower federal courts a. are, although much greater in number, irrelevant to a president's policy agenda. b. are not subject to partisan consideration. c. have a much greater probability of being rejected by the Senate. d. ...
*September 11, 2011 by HM*

**math-i have another question**

Player A and B invented a new game. The probability for Player A to win a round is 1/3 and the probability that Player B will win a round is 2/3. To make the game fair, Player A will score 3 points when he/she winds a round and Player B will score 2 points when he/she wins. ...
*May 21, 2007 by Amaris*

**statistics**

A researcher finds that the correlation between variable A and variable B is r = +.20. She also finds that the correlation between variable C and variable B is r = -.40. Which relationship is scientifically more useful and by how much?
*May 29, 2014 by tiph*

**statistics**

The below table shows the probabilities generated by rolling one die 50 times and noting the up face. What is the probability of getting an odd up face? roll 1 Probability 0.22 roll2 probability 0.10 roll 3 probability 0.18 roll 4 probability 0.12 roll 5 probability 0.18 roll ...
*May 3, 2012 by sc*

**Math (Probability) PLEASE HELP!!**

If a 20-sided fair die with sides distinctly numbered 1 through 20 is rolled, the probability that the answer is a perfect square can be expressed as a/b where a and b are coprime positive integers. What is the value of a+b?
*April 27, 2013 by Hale*

**Statistics**

a fair dice is tossed seven times. suppose that on tosses 2 through 7, the value seen is different from the value seen on the preceding toss. Let S denote the sum of the 7 value seen, the probability that s to be even is
*August 19, 2011 by Appollonius*

**Stats**

6. In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Taxi fare; Length of ...
*October 18, 2011 by Jen*

**independent variable**

What axis do you plot the independent variable and what axis do you plot the dependent variable? It does not matter. However, in the US it has become fashion in public schools and the pablum filled texts to suggest the horizontal axis be the home of the independent variable, ...
*October 8, 2006 by Shayn*

**math probability**

this is a probability question... Suppose you are asked to choose a whole number between 1 and 13 inclusive. (a) what is the probability that it is odd?...7/13 (b) What is the probability that it is even?...6/13 (c) what is the probability that it is a multiple of 3?...4/13 (d...
*December 18, 2008 by joe*

**Binomial Probability**

Before 1918, wolves were shown as 55% male, 45% female. From 1918 to present they were shown as 70% male and 30% female. In a random sample of 12 wolves, what was the probability that 6 were male? What was the probibility that 6 or more were female? What was the probability ...
*November 10, 2012 by Bill*

**Probability**

You throw a beanbag at a wall with 7 colored squares, each with an area of 1/4^2. If you hit a square, you win a prize. What is the probability of winning a prize? You need more information. For starters: 1) what is the total area of the wall? 2) Are landings on the wall ...
*December 5, 2006 by Kara*

**statistics**

f(y)= (1/c)e^(-y/2) if y is greater than or equal to 0 and f(y)=(1/c)e^(y/2) if y is less than 0 a) What is c? b)What is the probability distribution function?
*October 19, 2011 by Lauren*

**data management**

Tasha has a piggy bank that contains 15 loonies, 30 quarters, 20 dimes, and 7 nickels. a) if she chooses one con at a random to buy some candy, what is the probability of choosing a loonie or quarter? b) if she chooses three coins, all at once , what is the probability of ...
*September 25, 2009 by rock johnny*

**probability**

A jar contains 3 red balls and 2 green balls. You draw one ball at random. Determine the probability of selecting a. red b. green c. blue d. red or green
*March 17, 2011 by Evangelina*

**algebra 2**

a two-digit counting number has a value that is 13 greater than 3 times the sum of the digits. If the units digit is 1 greater than the tens digit, what is the number
*April 23, 2013 by chris*

**Math/probability**

Five different written driving tests are administered by the Motor Vehicle Department. One of these five tests is selected at random for each applicant for a driver's license. A group consisting of two women and three men apply for a license. (a) What is the probability that ...
*November 19, 2011 by Lorena*

**statistics**

. In his management information systems textbook, Professor David Kroenke raises an interesting point: “If 98% of our market has Internet access, do we have a responsibility to provide non-Internet materials to that other 2%? Suppose that 98% of the customers in your market do...
*April 4, 2013 by michel*

**statistics**

if we select a birth at random, what is thew probability the mother is 19 years of age or younger?
*June 22, 2010 by esther*

**math**

Find each probability for slecting a letter at random form the word ARKANSAS. P(Consonant)
*November 3, 2010 by Anonymous*

**statistics**

A random sample of 100 of a population Mean is 31 and standard deviation 22 Approximate probability of 28
*April 27, 2013 by Dorri*

**Data management gr.12**

Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
*July 10, 2013 by Celina*

**Chemistry check**

Could someone please just check my answers for this? I want to make sure I did these right. 1. A student reported the mass of ten glass beads as 2.507 +/- 0.015 g. What should the student report as the mass of one bead? Explain your answer. A: The student should report the ...
*January 30, 2007 by Bryant*

**Math-Probability**

A law firm has six senior and fourteen junior partners. A committee of 3 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?
*March 16, 2012 by Emma*

**Probability**

The results of a survey asking 100 people how they get their news. 15 From newspapers; 25 From television; 40 From both newspapers & Television and 20 from no sources; ------------------------- What is the probability that a person selected at random from this survey does NOT ...
*January 6, 2013 by LP*

**Finance-options**

I need help on the following question. Suppose that you are the manager and sole owner of ahighly leveraged company. All the debt will mature in one year. If at that time the value of the company is greater than the face value of the debt, you will pay off the debt. If the ...
*December 2, 2008 by David*

**math**

Suppose an event has a probability of p. What can you say about the value of p? What is the probability that the event will not occur? Explain
*August 26, 2008 by Jope*

**physics**

A beam of electrons with momentum p=10^-23 kg m/s passed through a narrow slit of width d=10^-5 m. What is the uncertainty component of the momentum in the x-direction due to the uncertainty principle (approximately)? a. change in p greater or equal to 10^-26 kg m/s b. change ...
*December 23, 2013 by Hil*

**math**

Suppose the yearly rainfall totals for a some city follow a normal distribution, with mean of 18 inches and standard deviation of 6 inches. For a randomly selected year, what is the probability, P, that total rainfall will be in each of the following intervals? (Round all ...
*October 17, 2010 by Anonymous*

**statistics**

Statistical Abstracts (117th edition) provides information aboutthe number of registered automobiles, including taxis, by state. The number ofregistered automobiles per 1,000 residents follows an approximately normaldistribution with mean ì = 514.6 and standard deviation ó = ...
*April 19, 2012 by Anonymous*

**Statistics **

Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please
*February 27, 2014 by Aria*

**algebra II**

find the expected value of the prize value $0 $1 $5 $20 probability 0.9359 0.05 0.01 0.003 $100 $1000 0.001 0.0001
*March 24, 2009 by chrissy*

**algebra**

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?
*January 20, 2011 by den*

**math**

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?
*October 13, 2011 by stephanie*

**probability**

Q: A train and a bus arrive at random between 9AM and 10AM. The train stops for 10 minutes and bus for ‘x’ minutes. Find ‘x’ so that the bus and train will meet with probability of 0.5
*February 7, 2014 by E V Shashank*

**Statistics -- Probability**

I need to calculate P(man is a ballet dancer and a musical performer) given the following information... In a random sample of male and female graduates of the New York School for the Arts between the ages of 22-35 you know that: the probability a man is a ballet dancer is 0....
*April 17, 2009 by Michael*

**Finance**

I need help on this study problem.----- A firm computes the probability distribution of possible net present values for a project and finds that it has an expected value of $125,000 and a standard deviation of $75,000. Assuming that the distribution of net present value is ...
*November 2, 2006 by Jenny*

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