Sunday

March 29, 2015

March 29, 2015

Number of results: 32,925

**Math help. **

1. 1 • 12 numerical expression variable expression; a is the variable variable expression; there is no variable variable expression; l is the variable 2. f ÷ 7 variable expression; there is no variable numerical expression variable expression; g is the variable variable ...
*September 17, 2014 by Anonymous*

**Statisitics:Standard Deviation of Population and o**

Standard Deviation of Population and of a Sample The weight of newborn children in the United States vary according to the normal distribution with mean 7.7 pounds and standard deviation 1.68 pounds. The government classifies a newborn as having low birth weight if the weight ...
*September 11, 2007 by Carma*

**Probability**

1.John puts the letters of the word FOOTFEST in 8 different envelopes. Paul chooses an envelope at random. (a)(i)Calculate the probability that Paul chooses an envelope containg letter O (1/8 ?) (ii)Calculate the probability tthat Paul doesn't chooses an envelope(5/8?) ...
*May 4, 2008 by Anonymous*

**Probability**

1.John puts the letters of the word FOOTFEST in 8 different envelopes. Paul chooses an envelope at random. (a)(i)Calculate the probability that Paul chooses an envelope containg letter O (1/8 ?) (ii)Calculate the probability tthat Paul doesn't chooses an envelope(5/8?) ...
*May 4, 2008 by Anonymous*

**stats again**

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
*July 5, 2007 by holly*

**Chemistry**

Would the value of molar absorbitivity value be greater, less, or equal for the absorbance of light at 550nm vs 650 nm?
*November 13, 2013 by Anonymous*

**Psychology Statistics**

Determine whether the numerical value is a parameter or a statistic? In a phone survey of 100 random homes in a country, 21 families had garages. Is this a parameter because the data set of 100 random homes is a population? Is this a statistic, because the data set of 100 ...
*September 9, 2011 by Margaret Sweet*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*June 18, 2013 by Katie*

**math**

Andre picks a card at random. Without putting the first card back, he picks a second card at random. What is the probability that both cards will be hearts. The cards showing are three hearts and two diamonds
*May 8, 2014 by Olivia*

**Algebra**

a bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
*July 23, 2009 by Joe*

**math**

A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
*March 9, 2010 by babygirl*

**Math**

Find the following probability if z is a standard normal variable: P(z>1.62).
*June 16, 2011 by Jayce*

**Qvntitative Methods**

CASE STUDY: 1 The bulbs manufactured by a company gave a mean life of 3000 hours with standard deviation of 400 hours. If a bulb is selected at random, what is the probability it will have a mean life less than 2000 hours? Question: 1) Calculate the probability. 2) In what ...
*September 25, 2013 by Sardar Hakim*

**Probability**

A boy forgot his password for his Internet gsme account. He has a total of 8 paaswords for various accounts. If he tries these passwords at random,one by one without repetition , what is the probability that he will log in to his Internet game account within 2 attempts ?
*February 10, 2014 by Anonymous*

**Probability**

A group of 90 students is to be split at random into 3 classes of equal size. All partitions are equally likely. Joe and Jane are members of the 90-student group. Find the probability that Joe and Jane end up in the same class.
*February 23, 2014 by qwerty*

**math study guide**

1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? (1 point) a 0.6 b 0.4 c 0.2 d 0.3 2. You roll a number cube 20 times. The number 4 is rolled 8 times. What is the ...
*June 6, 2014 by DragonBornFU5R0D48*

**Stats**

The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have blue eyes c. Find the probability that one of the three has blue eyes
*April 30, 2013 by Dave*

**pre-algebra**

Rewrite the equation so the variable is alone. Solve to find the value of the variable. 42=-2h Divide both sides by 2. Then change the signs of both sides. That will provide the answer. Possibly in 1 step: Divide by -ve 2
*March 15, 2007 by Julia*

**probability**

Two six-sided dice each have the numbers 1 through 6 on their faces. Neither die is fair, but they are both weighted the same. The probability of rolling a certain number on one die is given in the table below: # 1 2 3 4 5 6 probability 1/6 1/6 1/9 ? 2/9 ? If the probability ...
*March 8, 2013 by Anonymous*

**math**

If a student is selected at random, find the probability a)
*March 25, 2007 by Carlos*

**Physics~ ONE MOREE**

Which of the following must the investigator measure during an experiment? independent variable dependent variable <<<<< controlled variable
*December 29, 2014 by May*

**Math**

Webster Aquatic Center offers various levels of swimming lessons year-round. The March 2005 Monday and Wednesday evening lessons included instructions from Water Babies through Adults. The number in each classification is given in the table that follows. Swim Lesson Types No. ...
*July 4, 2012 by Bob*

**Statistics**

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 ...
*May 27, 2013 by Gayle*

**statistics help**

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) 0.38 0.1 0.07 0.12 0.33 (a) Find the mean of the number ...
*June 15, 2013 by Kim5*

**PROBABILITIES**

Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.037 and the probability that an item produced by factory B is defective is 0.05. A computer is selected at ...
*December 2, 2010 by cmb*

**6th grade math**

We are learning probability and can you please check my answer. Question: Enrique has 3 dimes, 2 quarters, and 5 nickels in his pocket. He takes one coin from his pocket at random. What is the probability that the coin is either a dime or a nickel? My answer is 8:10 which ...
*March 22, 2009 by Kathy*

**math**

a basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jameson picks a fruit at random and does not replace it. Then Brittany pricks a fruit at random. What is the probability that Jameson gets a banana and Brittany gets a pear...
*May 7, 2014 by help please*

**stats**

An analysis is done to determine the amount spent on fresh fruits and vegetables per person per week. In a certain area, assume this amount is normally distributed with a mean of $13.9 and a standard deviation of $ 4.91. A. When finding the probability that a random person ...
*October 10, 2010 by ff*

**math**

is this correct? 1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white) answer: 5x15x21= 1575 15x5=75 75/1575= 1/21 2. a number from 10 to 16 is drawn at random. P(a number greater than 14) answer: 2/7
*April 8, 2010 by Jane*

**science**

what is a control ,variable, independent variable, experimental variabale, dependent variable
*September 11, 2007 by hannah*

**Statistics **

1. A large video rental chain recently decided to change its rental policy, allowing an unlimited return date instead of requiring that movies be returned the next day. The marketing team reasoned that this would greatly increase the popularity of their stores, and also that ...
*November 22, 2010 by lina *

**Reposted: Math (for "google"**

In many families both parents work, as a result there is increasing need for day care. Data was collected; and one year in Canada approximately 32% of children aged 0 to 11 years were in day care for at least 20h per week. What is the probability, in a random poll of 60 ...
*June 6, 2007 by Writeacher*

**Statistics**

Shopping Outlet A shopping outlet estimates the probability distribution of the number of stores shoppers actually enter as shown in the table below. x 0 1 2 3 4 p(x) 0.05 0.35 0.25 0.20 0.15 What is the probability that shoppers are just window shopping and not entering any ...
*March 11, 2015 by Anon*

**STATS**

A statistically significant F value means that: a) The influence of the independent variable is less than the error b) he observed differences between groups are due to individual differences of the values and the error c) An effect of the independent variable d) None of the ...
*October 4, 2013 by MArtina*

**ALGEBRA**

Using x as the variable, write the equation or inequality that would correctly solve this problem. Eight times what number is greater than 72?
*June 25, 2014 by JD JOHNSON*

**statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In a study 306 babies were born, and 174 of them were girls. the sample data with a 0.01 significance level to test the claim that with this method, the probability of being a girl is ...
*November 25, 2013 by angela*

**statistics**

The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.4 minutes and a standard deviation of 3 minutes. Assume that the distribution of taxi and takeoff times is approximately normal. You may assume that the jets are lined up on a runway so that ...
*February 18, 2014 by larae*

**statistics**

1. The scores on a standardized test for high school students are normally distributed with a population mean of 500 and a population standard deviation of 100. Use the empirical rule (0LI refers to this as the standard deviation rule.). Make sure you provide graphs for each ...
*February 3, 2013 by lay*

**statistics**

Healthy breakfast contains the rating of 77 cereals and the number of grams of sugar contained in each serving. A simple linear regression model considering "sugar" as the explanatory variable and "rating" as the response variable produced the following regression line: rating...
*September 19, 2012 by Gee*

**stats**

Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13
*April 2, 2013 by chris*

**probability question - help!**

Two people agree to meet at a coffee shop. They each independently pick a random moment in time between 8 a.m. and 9 a.m. and show up exactly at their selected time. But they are very impatient, and only stay for 10 minutes after when they arrive. What is the probability that ...
*November 20, 2012 by mathfailure*

**Statistics**

The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone and 10% do not own a cell phone. Fifteen students are to be ...
*December 3, 2014 by Mackenzie *

**stattistics**

The p-chart is based on the assumption that the number of defective units in each sample is a binomial random variable. Choose one answer. A. True B. False
*June 22, 2011 by bharat*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*October 16, 2011 by Shirley*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*October 18, 2011 by Shirley*

**math**

of a set of 10 cards, 3 have red circles, 4 have yellow triangles, and 3 have green diamonds. you choose one card at random and then replace it. then you choose a second card. what is the probability that both cards have yellow triangles? Find the probability of obtaining the ...
*April 16, 2007 by dillon*

**statistics**

Find the test statistic, P-value, and critical value. Round to 3 decimal places. Claim: The mean IQ score of statistics professors is greater than 118. Sample data: n = 50, x = 120. Assume that σ = 15 and the significance level is α = .05 test statistic = P-value = ...
*April 8, 2014 by larae*

**stata**

What is the probability that a person selected at random from data will be male?
*October 23, 2010 by shiela*

**math**

If a permutation is chosen at random, what is the probability that it begins with at least 2 A's?
*September 26, 2012 by bballer*

**math**

Bob catches a train to work every day from monday to friday. the probability that the train is late on monday is 0.45. the probability that the train is late on any other day is 0.3. A day is chosen at random. Find the probability it is monday and the train is late
*March 8, 2015 by neel*

**FIND THE VALUE OF SQUARE**

I AM A NUMBER GREATER THAN 99 AND LESS THAN 1,000. TWO OF MY DIGITS THAT AREN'T NEXT TO EACH OTHER ARE THE SAME. MY TENS DIGIT COULD NOT BE GREATER AND IT IS 1 MORE THAN MY HUNDREDS DIGIT. WHAT NUMBER AM I?
*October 11, 2011 by ANDREW RAMIRES*

**Math**

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form ab, where a and b are coprime integers. What is the value of a+...
*April 20, 2013 by Ichigo*

**Math**

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form a/b, where a and b are coprime integers. What is the value of a...
*April 20, 2013 by Zeneth*

**algebra**

In a high school basketball game, a player on the home team makes two free throws. One student asks the student next to her what he thinks the probability of hitting two free throws in a row is. The student replies, "The probability of him making a free throw is probably about...
*September 22, 2014 by nautica*

**Math**

In the equation c=9h, identify which variable is the independent variable and which is the dependent variable.
*January 28, 2015 by Amy*

**Math Probability**

A lottery game has balls numbered from 0 - 9 If a ball is selected at random, what is the probability of selecting an even numbered ball or a 5 ? I am guessing this is Mutually exclusive event and hence used the OR= P(A)+P(B) concept considering 0 as an even number I keep ...
*December 4, 2011 by HM*

**Statistics**

The probability that a parent will visit a restaurant after kids game is know to be .68 and assumed the same for all parents. Assuming customer visits are independent and identical, determine the probability that 5 of 7 parents selected at random visit the restaurant. ...
*September 25, 2012 by Puffy*

**Hypergeometirc Distribution**

From a lot of 12 flares, 4 are selected at random. If the lot contains 4 defective flares *flares that will not fire), what is the probability that all 4 will not work? What is the probability that at most 2 will not work?
*May 4, 2011 by Alicia*

**Computer science**

If we have any five numbers. how do we find maximum and minimum number of those. You take the first number and store it in variable Min and Max. Then you take the second number. If that number is larger than the variable Max you overwrite Max and store that varible there. If ...
*December 15, 2006 by Sing*

**stats**

For a normal population with µ = 100 and σ = 20: 1. What is the probability of a particular score being greater than 110? 2. What is the probability of a particular score being less than 50?
*October 23, 2012 by Komal*

**Statistics**

1) A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard deviation of the defective parts? A) Mean = 3.5; ...
*February 15, 2009 by BEARHUG*

**Elementary Math**

The temperature of a cup of coffee is a discrete or continuous random variable? Am I correct " Discrete"
*August 8, 2009 by J.J.*

**Prob and Stats**

If X is a random variable with distribution X~N(350,110) find (a)P(X<400) and b)P(250<X<400)
*October 4, 2011 by Kathryn*

**statistics**

In a state,52%of the voters supports party-R, and 48% supports party-D. In second state 47% of the voters supports party-D. Suppose 100 voters are surveyed from each state. Assume the survey uses simple random sampling. what is the probability that the survey will show a ...
*November 15, 2011 by johnprabhakaran*

**statistics/psych**

Find TWO media examples of two types of correlations (explained below). You will have to do some research to find these. Next: (1) Find one media example (don�t make up your own) of a correlation that could be argued to be spurious (third variable). Explain your media ...
*November 16, 2011 by ashley*

**Mathematics**

Please help... In a 200 m swimming race between 8 boys, the probability of Omar winning the race if he is in one of the two outside lanes is 1/4. If he is in any of the other lanes, the probability of Omar winning is 1/3. If the lanes are drawn at random, what is the overall ...
*May 29, 2007 by Elizabeth*

**math answer check**

Patients who have artificial hip-replacement surgery experience pain the first day after surgery. Typically, the pain is measured on a subjective scale using values of 1 to 5. Let x represent the random variable, the pain score as determined by the patient. The probability ...
*June 1, 2013 by Nora 57*

**statistics**

The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected (a) What is the probability that the average of this sample will be above 68.3 degrees F? Probability = (4 decimal places) (b) ...
*February 25, 2011 by Anna*

**Calculus**

In the next questions, a particle is moving along a horizontal line according to the formula: s=2t^4-4t^3+2t^2-1 a) the particle is moving right when A. 0 is less than t is less than 1/2 B. t is greater than 0 C. t is greater than 1 D. 0 is less than t is less than 1/2, t is ...
*March 14, 2015 by Anonymous*

**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**

A toothpaste company did a survey at the mall. They found that 42.5% of those surveyed brushed their teeth twice a day. Which random numbers would you generate on a computer spreadsheet to simulate the survey? a. random integers from 425 to 1000 b. random integers from 1 to ...
*December 12, 2013 by Brandi*

**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*

**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*

**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*

**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*

**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*

**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*

**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*

**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*

**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**

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*

**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*

**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*

**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 probability**

A box has ten dollars, one is five dollar and four of one dollars. If two bills are chosen at random without replacement, find probability of getting A) amount of valued fifteen dollars B) amount of twelven dollars... is it 4 from 19-15 for A and 7 from 19-12= 7?
*November 14, 2014 by sandy*

**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*

**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*

**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*

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