Monday

September 22, 2014

September 22, 2014

Number of results: 8,007

**Probability & Stats**

what is the probability that no two students will have the same birth date in a size of 60 class
*February 17, 2011 by Apple*

**Probability and Stats**

A graduate class consists of six students. What is the probability that exactly three of them are born either March, June or November?
*August 8, 2012 by Lori*

**stats**

Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30. What is the probability that fewer than 40 batteries will last at least 8...
*March 10, 2013 by cate*

**problem stats**

an instant lottery game gives you probability .02 of winning on any one play. Plays are indpendent of each other. If you play 5 times, what is the probability that you win at least once.
*October 15, 2007 by Kate*

**problem stats**

an instant lottery game gives you probability .02 of winning on any one play. Plays are indpendent of each other. If you play 5 times, what is the probability that you win at least once.
*October 15, 2007 by Kate*

**Stats**

I roll a pair of fair dice and compute the number of spots on the two sides facing up. Denote this total by X. The probability distribution of X is X Prob 2 1/36 3 2/36 4 3/36 5 4/36 6 5/36 7 6/36 8 5/36 9 4/36 10 3/36 11 2/36 12 1/36 The probability that X is an even number is
*July 2, 2013 by MT*

**stats**

The probability of receiving a false positive on a mammogram is 7%. If the patient receives 10 mammograms in her lifetime what is the probability that none of the tests come back as a false positive?
*April 17, 2010 by kathryn*

**Stats**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow.
*February 8, 2014 by Ashley*

**bussi./stats**

what is the probability that a loaf of bread is between 22.75 and 23.00?
*September 6, 2011 by tim *

**stats**

Use normal approximation(Z-score for p-hat) to find the probability that student scores 80% or lower on a 100 question quiz. A)If the test contains 250 questions, what is the probability that student will score 80% or lower
*July 14, 2011 by Ryan*

**stats probability**

help please! A IRS auditor randomly selects 3 tax returns from 53 returns of which 13 contain errors. what is the probability that she selects none of those errors?
*April 12, 2010 by anonymous*

**PROBABILTY-STATS HELP**

A product is assembled from 3 components X,Y,Z and the probability of these components being defective is 0.01, 0.02,0.05. i have to find the probability that the assumed product will not be defective? can someone explain to me, how do it? thanks
*April 5, 2012 by Taskeen*

**Stats**

Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.3 0.5 0.2
*October 25, 2011 by Jen*

**stats**

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

**stats**

what is the probability that a 6 digit phone number contains at least one 8?
*July 19, 2014 by michelle*

**Stats**

Fortunately, plane crashes are rare events. Suppose that commercial crashes occur on an average (mean) of 1.1 per year (Hint: Poisson). a. What is the probability that this year will be crash free? b. If there is a crash, what is the probability that there will be more than ...
*January 24, 2008 by MoJo*

**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*

**stats**

Between 11 P.M. and midnight on Thursday night, Mystery Pizza gets an average of 5.7 telephone orders per hour. a) Find the probability that at least 32 minutes will elapse before the next telephone order. b) Find the probability that less than 17 minutes will elapse. c) Find ...
*October 31, 2010 by anonymous*

**STATS**

a woman standing on a bridge overlooking a major insterstate wants to know how likely it is that the next 20 out of 50 cars that pass under the bridge are red cars, if she has observed in the past that the probability than any given car on that interstate highway is red is ...
*May 25, 2011 by Mattie*

**college Stats**

If Y has a geometric distribution with success probability p, show that P(Y= an odd integer)= p/(1-(q^2))
*October 20, 2009 by james*

**stats**

Find the probability that the company will meet its goal on a particular 50 miles of line
*October 17, 2011 by Anonymous*

**MATH STATS URGENT**

The Houston Rockets and San Antonio Spurs will play a "best two out of three" series. Assume that Houston has a probability of 1/3 of winning any game. a. Draw a probability tree showing possible outcomes of the series. Label the branches with appropriate probabilities. b. ...
*April 24, 2014 by Lisa*

**MATH STATS URGENT**

The Houston Rockets and San Antonio Spurs will play a "best two out of three" series. Assume that Houston has a probability of 1/3 of winning any game. a. Draw a probability tree showing possible outcomes of the series. Label the branches with appropriate probabilities. b. ...
*April 25, 2014 by Lisa*

**Stats**

The probability of a child getting coal in their stocking is 0.2. If Santa visits 3 kids on Christmas day a) what is the probability of 2 children getting coal? b) 1 or fewer children receiving coal? Please help me - my brain is fried!
*December 4, 2013 by Wanda*

**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*

**stats-probability**

given a chart with rain in inches- the greatest amount being 15 inches on the chart, we know the cumulative proability is 1. what is the probability of more than 15 inches of rain falling
*January 21, 2011 by joy*

**Stats**

Suppose that you are in a class of 31 students and it is assumed that approximately 10% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed. (b) Compute the probability ...
*February 16, 2014 by Kay*

**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*

**Stats**

The number of failures of a testing instrument from contamination particles on the product is a Poisson random variable with a mean of 0.028 failure per hour. (a) What is the probability that the instrument does not fail in an 8-hour shift? (b) What is the probability of at ...
*February 25, 2014 by Ashley*

**stats**

women age 20-29 is 36ml staandard deviation 7ml. What is probability greater than 45ml and between 30 and 62 ml
*August 27, 2011 by anna*

**Stats**

Suppose X is a uniform random variable with C = 20 and d = 90. Find the probability that a randomly selected observation is between 23 and 85.
*November 17, 2012 by Marie*

**Stats**

You have many old textbooks in your apartment. You have 6 math books, 7 econ, and 4 accounting. Assume that each textbook is different than the other. A) What is the probability that the last book is one of the economic textbooks? B) What is the probability that none of the ...
*September 9, 2014 by Rebekah*

**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*

**Stats **

Assume that event A occurs with probability 0.4 and event B occurs with probability 0.5. Assume that A and B are disjoint events. The probability that either event occurs (A or B) is A. 0.0 B. 0.7 C. 0.9 D. 1.0.
*March 29, 2014 by Tracy *

**stats**

. Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.4 0.25 0.35 Please show all of your work.
*October 7, 2012 by Anonymous*

**Business stats**

I have just started business school and am struggling with this HW problem. any help would be great!!...A certain type of new business succeeds 60% of the time. Suppose that 3 such businesses open (where they do not compete so its reasonable to believe that their relative ...
*April 14, 2009 by bob*

**stats**

Use this z-score formula for this problem: z = (x - mean)/(sd/√n) x = 1.25, 1.50 mean = 1.35 sd = 0.25 n = 40 Calculate two z-scores, then use a z-table to determine probability between the two scores. I hope this will help get you started. •stats. - Christina, Monday, ...
*March 18, 2013 by Christina Ms Sue please help*

**bus stats**

A manufacturing company has 5 identical machines that produce nails. The probability that a machine will break down on any given day is .1. Define a random variable X to be the number of machines that will break down in a day. a. what is the appropriate probability ...
*March 25, 2011 by Mich Mich*

**Stats**

A random sample of two hundred fifteen adults is selected from a certain population of registered voters. Assume the population is 20% democrats. Use a normal approximation to estimate (a) the probability the sample contains exactly 48 democrats, and (b) the probability the ...
*October 21, 2010 by Chris*

**stats**

Between 11 P.M. and midnight on Thursday night, Mystery Pizza gets an average of 4.2 telephone orders per hour. Find the probability that,
*October 8, 2010 by mnmn*

**stats**

what is the probability that at least one of the marbles drawn is green? I thinks it's 1/11 but not sure. Then what is the probability that only one of the marbles drawn are green?
*March 14, 2010 by keisha*

**business stats**

A market research firm conducts telephone surveys with a 44% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the ...
*May 24, 2010 by chelsea*

**bus stats**

A deck of playing cards contains 52 cards, four of which are aces. What is the probability that the deal of a five-card hand provides: a. What is the appropriate probability distribution for X? Explain how X satisfies the properties of the distribution. b. A pair of Aces? c. ...
*March 25, 2011 by Mich Mich*

**stats **

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*June 14, 2011 by jenny*

**stats **

Suppose that 20% of Canadians smoke. In a random sample of 20 Canadians, find the probability that more than 1 smokes
*November 10, 2013 by alf*

**stats**

if you randomly answer a t/f test and want to figure the possibililty of gettng at least an 80......how do you start and then once you have done this, what if you want to try it 4 more times? HELP Let N be the number of questions. You are asking for the probability of getting ...
*July 5, 2007 by holly*

**stats**

is there a good, relevant sites where i can get stats extra help?
*October 11, 2007 by Keirson*

**stats **

a horse race has 11 entries, assuming that their are no ties what is the probability that four horses owned by one person finish first second third and fourth
*September 20, 2012 by chuck*

**Stats**

Approximate the probability of less than 90 infant deaths in a sample of 1000 births, if the infant mortality rate is 0.10. P(X<90)
*March 20, 2009 by Sally*

**stats**

Among the contestants in a competition are 44 women and 26 men. if 5 winners are randomly selected, what is the probability that they are all men?
*July 14, 2010 by jEFFREY*

**mba stats class, help!!**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*June 15, 2011 by jenny*

**Algebra 2: Probability and Stats**

The scores on an exam are normally distributed, with a mean of 77 and a standard deviation of 10. What percent of the scores are greater than 87? * 68% * 16% * 84% * 2.5%
*May 24, 2010 by Skye*

**Stats**

The unemployment rate in a city is 9%. Find the probability that at least 2 out of 8 people from this city sampled at random are unemployed.
*October 28, 2010 by LiCee*

**Stats**

In 1898 L. J. Bortkiewicz published a book entitled The Law of Small Numbers. He used data collected over 20 years to show that the number of soldiers killed by horse kicks each year in each corps in the Prussian cavalry followed a Poisson distribution with a mean of 0.63. (a...
*February 25, 2014 by Ashley*

**STATS**

The probability of a manufacturing defect in an aluminum beverage can is .00003. If 100,100 cans are produced, (a) Find the approximate probability of at least two defective cans. (Round your answer to 4 decimal places.) (b) Find the approximate probability of at least three ...
*October 30, 2010 by Helen*

**Stats**

A bag of colored blocks contains the following assortment of colors: red (18), blue (14), orange (20), purple (14), green (10), and yellow (4). Construct the probability distribution for x. I'm so lost....
*October 24, 2011 by Jennifer*

**Stats....PLZ HELP....**

A bag of colored blocks contains the following assortment of colors: red (18), blue (14), orange (20), purple (14), green (10), and yellow (4). Construct the probability distribution for x.
*October 25, 2011 by Jen*

**stats**

The amount that airlines speed on food per passenger is normally distributed with means $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50?
*March 17, 2013 by chris*

**stats.**

The amount that airlines spend on food per passenger is normally distributed with mean $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50.
*April 2, 2013 by chris*

**bus stats**

John parks cars at a hotel. On the average, 6.0 cars will arrive in an hour. A driver's decision on whether to let John park the car does not depend upon any other person's decision. Define the random variable X to be the number of cars arriving in any hour period. a. Wat is ...
*March 25, 2011 by Mich Mich*

**Stats (probability)**

Of 10 girls in a class, 3 have blue eyes. If two girls are chosen at random, what is the probability that (i) both have blue eyes, (ii) neither has blue eyes, (iii) at least one has blue eyes? I have the answers but do not know how to get them. I'm trying to use a tree diagram...
*March 16, 2011 by Morgan*

**stats**

Test scores on a university admissions test are normally distributed, with a mean of 500 and a standard deviation of 100. 4 marks a. What is the probability that a randomly selected applicant scores between 425 and 575? 4 marks b. What is the probability that a randomly ...
*June 1, 2013 by sue*

**stats**

A manufacturer of automobile batteries claims that the distribution of battery life is 54 months with a standard deviation of 6 months. We take a random sample of 50 batteries. a. Find the probability that their mean life is less than 52 months. b. Find the probability that ...
*July 31, 2011 by michelle*

**Stats**

Each of 2 players, independently, play a game 5 times, with each game having probability of success 0.40. What is the standard deviation of the sum of the games they win
*October 9, 2011 by Jay*

**stats**

a candidate receives 60% of the N votes in an election, where N is very large. Compute the probability that he leads after a count of the first 100 votes.
*October 29, 2011 by st*

**Stats**

3. Suppose you work for the Ford Motor Company and must establish regulations concerning the maximum number of people who can ride in a minivan. Ford tells you that the total number of people in a minivan follows a normal distribution with a mean of 6 and a standard deviation ...
*August 4, 2012 by AMbe*

**Algebra 2 - stats and probability**

I need someone to tell me how to set these up please? 1. A box contains 4 quarters. 2 of the quarters have the American eagle on the back. Suppose you draw 2 quarters at random with replacement. a. What's the probability that both have the American eagle on the back? b. What's...
*May 13, 2009 by Kay*

**Stats**

Among 15,378 Delta airline passengers randomly selected, 3 were bumped from a flight against there wishes (based on data from the us dept of transportation) find the probability that a random selected passenger is involuntarily bumped. Is such bumping unusual? Does such ...
*February 1, 2011 by Help please!*

**Stats**

Sally rolls a fair number cube 8 times and gets a 5 twice. What is the experimental probability that on her next roll, she will roll a 5? I know that experimental probability is f/n, so the number of trials is now 9, but is the number of times Sally roll a 5 two times or three?
*August 22, 2014 by Liv*

**Stats**

A question on a test is answered correctly by 22% of the students find the probability that in the next 150 students there will be more than 40 correct answers use the normal distribution
*February 10, 2014 by Anonymous*

**STATS**

The top selling Red and Voss tire is rated 70,000 miles means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400. a. What is the probability that a tire ...
*September 16, 2011 by SANDRA*

**stats**

suppose that the wait time at the bank is uniformly distributed in the interval 4-min-8min find the probability that a randomly selected customer has to wait longer than 6.5 minutes
*April 29, 2012 by zuly*

**Prob&stats**

Search results for: Using numbers 1-20 what is probability a randomly chosen number is either an even number or a number greater than 14?
*February 29, 2012 by Rosa*

**Prob&stats**

Search results for: Using numbers 1-20 what is probability a randomly chosen number is either an even number or a number greater than 14?
*February 29, 2012 by Rosa*

**stats**

The probability that an individual has hearing loss is .40. The probability that an individual has poor eyesight is .55. If hearing loss and poor eyesight are INDEPENDENT events, what is the probability of a person with hearing loss and poor eyesight?
*November 17, 2013 by lono*

**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**

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*

**business stats**

Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that: (Use the poisson approximation to the binomial.)
*July 7, 2014 by Beth*

**stats**

Microbes in a certain colony exposed to radiation have a 1/6 chance of being mutated. a. If ten microbes from the colony are sampled, what is the probability that exactly 4 will be mutated? b. If ten microbes from the colony are sampled, what is the probability that at most 4 ...
*October 16, 2010 by jimmy*

**STATS**

In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised price. The cashier scans 820 items. a) What is the expected number of mismatches and standard deviation? (Round your expected number of mismatches to 1 ...
*October 30, 2010 by Helen*

**stats**

a student randomly guesses at five multiple-choice questions, each question has five possible choices (suppose the choice for each question is independent): a) Find the probability that the student gets exactly three correct. b) What is the probability that the student gets ...
*March 31, 2012 by jeanette*

**Stats**

A bag contains 10 red and 8 green marbles. 5 marbles are selected without replacement. What is the probability that exactly 2 are green?
*June 6, 2011 by McKenzie*

**stats math**

Suppose Ray makes 85% of his free throws. What is the probability that Jordan will make 2 free throws in a row?
*November 26, 2012 by denise*

**C++ Programming**

Design and create a class named Stats that has an array of 12 doubles as one of its member variables. The values in the array should be set by making 12 calls to a public member function named setValue that accepts two arguments, an integer indicating which value is being ...
*June 8, 2010 by kyuu09*

**stats**

You took a 5-question multiple choice quiz with 4 choices for each question. If you guess at random on each question, what is the probability that you get at least one question correct?
*November 15, 2011 by sia*

**Math, Stats**

the probability is 0.6 that a person shopping at a certian store will spend less than $20. For group of size 19, find the mean number who spend less then $20.
*February 21, 2011 by Olivia*

**Math, Stats**

the probability is 0.6 that a person shopping at a certian store will spend less than $20. For group of size 19, find the mean number who spend less then $20.
*February 21, 2011 by Olivia*

**stats**

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.18 0.20 0.32 0.28
*October 7, 2012 by Anonymous*

**Stats**

About 35% of the population has blue eyes (based on a study at Indiana University). a. If someone is randomly selected, what is the probability that he or she does not have blue eyes?
*November 14, 2012 by Yolanda*

**Math & Stats**

Please help I was up till 2am trying to figure this out last night, Thanks The top selling Red and Voss is rated 70,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles...
*February 11, 2011 by Tiffany*

**stats**

Question Part Points Submissions Used 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) 0.35 0.15 0.15 0....
*April 2, 2013 by kim*

**Stats**

A test has 15 true or false questions and 10 multiple choice questions (each with 4 choices). All questions are weighted equally. Jack has not studied at all for the test and randomly guesses. 1. What is the probability that Jack gets 96% on the test? a. 0.000000001 b. 0....
*October 23, 2010 by Rhea *

**stats math**

Suppose that two cards are randomly selected from a standard 52-card deck. What is the probability that the first card is a spade and the second card is a space if the sampling is done without replacement?
*November 26, 2012 by denise*

**stats**

group rh+ 39 35 8 4 rh- 6 5 2 1 People with blood type AB and rh+ are considered to be universal recipients. If three of the 100 subjects are selected find the probability they are all universal recipients.
*February 6, 2011 by Help please!*

**Stats**

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.11??
*October 24, 2011 by Jennifer*

**Stats**

The time you wait in a bank until you are served by a teller is exponentially distributed with mean 10 minutes. Calculate the probability that you will have to wait between 5 and 15 minutes.
*September 21, 2012 by Teniche*

**stats**

if the true proportion of californians who are unemployed is 11%, what is the probability that a sample of 100 californians are unemployed?
*March 14, 2011 by stacy*

**stats**

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of $30 and a standard deviation of $9. What is the probability that a randomly selected customer will spend $20 or more at this store?
*March 29, 2013 by cate *

**Is this right?? Stats....**

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.12??
*October 25, 2011 by Jennifer*

**Stats **

The distribution of lifetimes for a particular brand of lightbulbs has a mean of 110 hours and a standard deviation of 20 hours. Suppose a random sample of 35 lightbulbs is taken for observation. What is the probability that the sample mean lifetime will be between 105 and 115...
*January 31, 2011 by Ryan*

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