Saturday

September 5, 2015
Number of results: 8,199

**statistics**

The Denver Post stated that 80% of all new products introduced in grocery stores fail (are taken off the market) within 2 years. If a grocery chain introduces 66 new products, what is the probability that within 2 years , 7 or more fail? What is the probability that within 2 ...
*March 23, 2012 by lola*

**Math**

Suppose there is a bag containing 25 envelopes and 10 of the envelopes contain prizes. You reach in, without looking, and select 2 envelopes, without replacement. a) What is the probability that both of your picks are winner? b) What is the probability that none of your picks ...
*March 22, 2013 by Anonymous*

**Statistics**

Service times for customers at a post office follow some right-skewed distribution with mean 2.91 minutes and standard deviation 1.74 minutes. (a) Can you calculate the probability that the average service time for the next two customers is less than 2.64 minutes? If you can...
*November 4, 2014 by Mel*

**Probability**

Before leaving for work, Victor checks the weather report in order to decide whether to carry an umbrella. On any given day, with probability 0.2 the forecast is “rain" and with probability 0.8 the forecast is “no rain". If the forecast is “rain", the probability of actually ...
*February 13, 2015 by qwerty*

**Statistics**

Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated with the sex of the three ...
*May 10, 2008 by Danny*

**Statistics**

Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated with the sex of the three ...
*May 11, 2008 by Danny*

**Maths**

The probability that Don's car passes the MOT test next time is 4/5, that Mag's car passes is 5/7 and that Joe's car passes is 1/2. Find the probability that a)all three will pass b)just two out of the three will pass c)no car passes? (might need a probability tree) PLEASE HELP!
*February 4, 2008 by Anonymous*

**statistics**

Find the indicated binomial probabilities. Round to the nearest 3 decimal places. In a local college, 20% of the math majors are women. Ten math majors are chosen at random. 1) What is the probability that exactly 2 are women? 2) What is the probability that 2 or less women ...
*March 23, 2010 by please help me!*

**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*

**Math- probability**

In a city, every day is either cloudy or sunny (not both). If it's sunny on any given day, then the probability that the next day will be sunny is 3/4. If it's cloudy on any given day, then the probability that the next day will be cloudy is 2/3. a) In the long run, what ...
*May 15, 2015 by Anonymous*

**statistics**

Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.
*May 17, 2011 by coya*

**statistics**

Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.
*August 2, 2011 by lee*

**PROBABILITY MATH**

Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 5 possible answers. Explain to me the answer?
*November 9, 2011 by HM*

**math**

2 cards are drawn without replacement from an ordinary deck of 52 playing cards. What is the probability that both are spades if the first card drawn was a spade? I think you subtract out the first spade making the probability 12/51 since you take off the first card already ...
*November 22, 2010 by m*

**math**

CountingOutcomes and Theoretical Probability A computer store sells 4 models of computer (m1,m2,m3 m4. Each model can be fitted with 3 sizes of hard drive (A,B,C,) 1- Find the sample space. 2- What is the probability of choosing a model with a size C hard drive? 3- What is the...
*January 31, 2010 by Julainna*

**Probability**

1) What is the probability of tossing 6 coins and getting at least two tails? 2) Suppose you flip a penny, a nickel,a dime and a quarter. What is the probability of getting heads on the penny and nickel and dime and tails on the quarter? Please show steps for the solutions. ...
*June 4, 2010 by Kevin*

**math**

Assume that the business makes a profit with probability 0.3 in the first year. For each year thereafter, the business makes a profit with probability 0.7 if it made a profit in the previous year, and with probability 0.2 if it did not make a profit in the previous year. What ...
*October 4, 2010 by Tiff*

**FINITE**

Assume that the business makes a profit with probability 0.8 in the first year. For each year thereafter, the business makes a profit with probability 0.8 if it made a profit in the previous year, and with probability 0.2 if it did not make a profit in the previous year. What ...
*February 16, 2011 by Hil-hellpp!*

**Quantitative Methods**

Assume you have applied to two different universities (lets refer to them as Universities A and B) for your graduate program. In the past 25% of students (with similar credentials as yours) who applied to University A were accepted, while University B accepted 35% of the ...
*March 18, 2009 by V*

**Quantitative Methods**

Assume you have applied to two different universities (lets refer to them as Universities A and B) for your graduate program. In the past 25% of students (with similar credentials as yours) who applied to University A were accepted, while University B accepted 35% of the ...
*March 19, 2009 by V*

**Statistics**

A multiple choice test has five choices. Therefore the probability of getting the correct answer by guessing is 0.2. The test has six questions. Use the binomial formula with n = 6 and p = 0.2 to (a) Determine probability of getting two questions correct. (b)Determine ...
*March 3, 2013 by Sue*

**maths-probability**

A box contains n balls of which 2 are red and the rest are green. Two balls are to be selected at random one after the other from the box without replacement. If the probability of selecting 2 red balls is 1/28, find; the value of n the probability that a red is selected ...
*February 24, 2015 by imoro*

**COLLEGE MATH**

In 2003, the probability that a randomly chosen bag of cement from the world supply was consumed in the U.S. was .05, while the probability that it was consumed in China was .45. What is the probability that a randomly chosen bag of cement was consumed in neither country?
*April 12, 2009 by Suzie*

**probability**

There is a .97 chance that no accident will occur during any particular day at a racetrack of local importance. the probability of one accident a day is .02, and the probability of two accidents is .01. a. What is the expected number of accidents in a day? b. What is the ...
*January 31, 2012 by 12-year-old-poet*

**statistics**

Define each of the following probability terms for the scenario of determining the probability that when a couple has 3 children, they will have exactly 2 boys. Assume that boys and girls are equally likely and that the gender of any child is not influenced by the gender of ...
*September 6, 2014 by thankyou*

**probability**

A box contains n balls of which 2 are red and the rest are green. Two balls are to be selected at random one after the other from the box without replacement. If the probability of selecting 2 red balls is 1/28, find; the value of n the probability that a red is selected ...
*February 24, 2015 by imoro*

**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*

**probability and statistics**

the population of sat scores forms a normal distribution with a mean of u=500 and a standard deviation of o=100. if the average sat score is calculated for a sample of n=25 students. a. what is the probability that the sample mean will be greater than m=510? in symbols, what ...
*January 6, 2012 by darrell*

**statistics and probability**

It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean of 70% and a standard deviation of 9%. (A) If a student must obtain a mark of 50% to pass the exam, what proportion of students fail the exam? (B) What is the probability that a ...
*February 26, 2011 by Adam*

**statistics**

4. A Prisoner escapes from jail. There are three roads leading away form the jail. If the prisoner selects road A to make good here escape, the probability that she succeeeds is 1/4. If she selects road B, the probability that she succeeds is 1/5. If she selects road C, the ...
*May 18, 2009 by jamar*

**Probability.**

Sorry for posting so many topics, but I really need help on this stuff. I recently lost my work I did on a seperate sheet from 2 weeks ago, and now I can't seem to find the answer again. a fair six-sided die is tossed seven times in a row. A) What is the probability that a "4...
*May 22, 2008 by Tom*

**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 help needed**

In the game of roulette, a steel ball is rolled onto a wheel that contains 18 red, 18 black, and 2 green slots. If the ball is rolled 24 times, find the probability of the following events. A. The ball falls into the green slots 4 or more times. Probability = B. The ball does ...
*February 22, 2009 by Jordana*

**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*

**Probability**

A balanced coin is tossed 8 times. What is the probability of getting exactly 2 heads given that there were at least 2 heads in the 8 tosses?
*January 17, 2010 by Leesa*

**Probability**

A balanced coin is tossed 8 times. What is the probability of getting exactly 2 heads given that there were at least 2 heads in the 8 tosses?
*January 17, 2010 by Leesa*

**probability**

if a fair coin is tossed 4 times, what is the probability of getting heads the first 3 times, and tails the fourth itme?
*May 10, 2011 by kristy*

**Math-probability**

One card is selected at random from a deck of cards. Determine the probability that the card is a black heart.
*July 19, 2011 by Jen*

**Math - Probability**

what is the probability of getting two sets of 8 digit numbers having 5 digit are the same number and order.
*July 22, 2011 by Tracy*

**Math**

The probability that Aaron sees Hannah on any given day is 1/2. What is the probability that he sees her 3 out of all 5 days this week?
*July 31, 2012 by Trisha*

**math**

for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=5,p=1/3, x=4
*November 19, 2012 by Katarzyna*

**math**

for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=5,p=1/3, x=4
*November 20, 2012 by Andrew*

**math**

for n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x succes n=5,p=1/3, x=4
*November 20, 2012 by Andrew*

**Probability**

If 5 juniors and 4 seniors apply for a job at a school which has 2 openings, what is the probability that 1 junior and 1 senior will be randomly chosen for the job.
*April 19, 2013 by Jane*

**probability**

Find the probability of seeing at most 5 dots, but also an odd number of dots when 2 fair dice are rolled.
*April 21, 2014 by heny*

**math check probability **

A number cube with the numbers 1 through 6 is rolled. Find the given probability. ---------------------------------------- 2. P(number ≥ 3) A. 4/6 B. 1/6***** C. 2/6 D. 5/6
*May 3, 2014 by me*

**math**

The overall probability of a student failing an exam is 40%. Calculate the probability that in a group of 6 students, at least 4 passed the exam.
*December 13, 2014 by susan*

**statistics**

A fast food chain claims that all of its quick win soda cups are winners. (There is a little tab you pull off the side of the cup which says either you are a winner or not. Lisa bought 8 sodas to try her luck. What is the probability that at least 5cups were winners? What is ...
*March 23, 2012 by lola*

**math**

The probability that Ryan chooses Spanish is 0.86 and the probability that Riley chooses Spanish is 0.73. State the probability that: a. they both chose Spanish b neither of them choose Spanish c. only one of them chooses Spanish d. at least one of them chooses Spanish
*March 9, 2015 by Kelly*

**statistics**

Three horses, A, B and C are in a race. A and B have the same probability of winning, and each is twice as likely to win as C. Find the probability of B or C winning.
*March 19, 2009 by Carline*

**Statistics - Monte's Dilemma**

Why does it make a difference when you switch doors? What is the probability of winning given that you stayed and what is the probability given that you switched?
*October 15, 2009 by Bob*

**math probability **

3 people are selected at random without replacement out of 12 girls and 3 boys. What is the probability of selecting all girls?
*April 19, 2011 by Anonymous*

**Probability**

7) Suppose that you roll a pair of standard 6-sided dice a total of 42 times. What is the probability that you will get a sum of 5 at least four times?
*March 22, 2012 by Anne*

**probability**

A company manufactured 1, 000 televisions. Testing showed that 20 of the televisons were defective. What is the experimental probability that the next television will be defective?
*April 18, 2013 by ashley*

**Math**

Choose a natural number between 1 and 100, inclusive. What is the probability that the number chosen is not a multiple of 4? (Enter the probability as a fraction.)
*June 12, 2013 by Ronald*

**Math- Probability**

A committee of five people is to be formed from six lawyers and seven teachers. Find the probability that none are lawyers.
*July 29, 2013 by Ted*

**mathematics Probability**

A simple 5_sided spinner is numbered 1,2,3,4,5.On spinning the spinner once,what is the probability of getting a prime and an even number?
*November 3, 2014 by thessa*

**Statistics and Probability**

Winning the jackpot in a lottery requires that you select the correct three numbers between 1 and 51 and in a another separate drawing you must select the correct single number between 1 and 15. Find the probability of winning the jackpot- The probability of winning the ...
*October 13, 2014 by Macy*

**Math**

Probability -if desks are grouped by 4 and if there are 11 boys and 13 girls in a class what is the probability that I will get placed in a group of all girls?
*October 14, 2008 by Olivia*

**Probability**

A number cube, numbered 1 through 6, is rolled once. What is the probability of rolling an even number that is not prime? 1/6 1/3 1/2 2/3
*July 22, 2010 by Ross*

**probability**

Let A and B two mutually exclusive events of a sample space S. If P(A)=0.6, P(B)=0.2 , find the probability of each of the following events a)P(A ∩ B)
*July 25, 2010 by anonymous*

**probability**

If you pick a number completely at random from the natural numbers between 1 and 42, find the probability that the number is a multiple of 3.
*October 4, 2010 by Anonymous*

**math probability**

a 3 section spinner which each outcome is not equally likely.if you spin the spinner once,what is the probability that it will stop on a?
*May 7, 2012 by jay*

**RES/351**

under what conditions would you recommend the following probability sample non–probability sample
*July 14, 2012 by a*

**probability**

if 2 white balls are drawn a box of 5,find the probability that all are white using bayes theorem
*August 31, 2012 by akshay*

**Math**

Is this correct? If one card is drawn from a regular deck of cards,what is the probability the card will not be an ace? 1/13 is the probability
*November 9, 2012 by Alex*

**statistics**

Consider the probability that less than 13 out of 151 CDs will be defective. Assume the probability that a given CD will be defective is 12%
*March 25, 2013 by Tammy*

**Probability**

the expected number of defects in a particular size is 5. What is the probability of getting one or less defects in the sample
*April 22, 2014 by Nedge5q*

**math**

I hope i am on the right track. Please look at my answer so I am doing correctly. The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing a vowel from the hat? (vowels are a, e, i, o u.) Number of letters...
*July 7, 2012 by Bria*

**Business Statistics**

John & Jane are married. The probability that John watches a certain television show is .4. The probability that Jane watches the show is .5. The probability that John watches the show, given that Jane does, is .7. 1) find probability that both John & Jane watch the show. 2) ...
*June 21, 2011 by CC*

**Probability and statistics**

The probability that the life time of randomly chosen device is below average, average,above average are respectively 0.2,0.5,0.3. The probability that of the 3 randomly chosen devices lifetimes of 2 are above average and 1 below average equals a.0.054,b.0.018,c.0.036,d.0.012
*March 1, 2012 by Arun*

**statistics**

Find the indicated binomial probabilities. Round to the nearest 3 decimal places. In a local college, 20% of the math majors are women. Ten math majors are chosen at random. 1) What is the probability that exactly 2 are women? 2) What is the probability that 2 or less women ...
*March 23, 2010 by please help me!*

**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 ...
*March 25, 2010 by kay*

**math - probability and statistics**

P(E)=.4, P(F)=.5 and P(E[intersect]F)=.1 , Calculate P(F[suchthat]E)=? Using conditional probability, I got .2 as the answer, right? Is the answer the same for P(EsuchthatF)?
*August 31, 2009 by Dee*

**math**

Consider the experiment of rolling a single die. Find the probability of the event described. What is the probability of rolling a number less than or equal to 4?
*April 12, 2010 by KiKi*

**probability**

If you were to spin a spinner that had eight equal parts labled 1-8 three times what is the probability that all three numbers are (3 or greater than five)?
*April 20, 2010 by lucky*

**ststistics**

each tire of an 18 wheeler has a probability of 5% TO maintain on a 10000 mile trip. WhAt is the probability that no more than 3 tires need maintenance during this trip. How do i do this?
*January 20, 2011 by pat *

**math-probability**

I have to do a math project using probability. I thought I might use Go Fish cards but I am not what kind of questions to ask can you help please?
*February 25, 2012 by christy*

**MATH**

tree diagra probability: tree diagram with three equal parts, what is the probability, if we spin twice of getting at least one a
*April 1, 2012 by John*

**Math Probability**

At a political rally there are 20 republicians 13 democrates 6 independents. if a person is chosen at random what is the probability that the person is either a democrate or and independent?
*April 16, 2012 by Antonio*

**Math: Geometry**

If 0 < y < 1 and 0 < x < 1, find the probability that y < x. Begin by sketching te graph, and then use the area method to find the probability. Please help me. I do not understand. Thank you in advance!
*April 23, 2012 by Rose*

**Math: Geometry**

If 0 < y < 1 and 0 < x < 1, find the probability that y < x. Begin by sketching te graph, and then use the area method to find the probability. Please help me. I do not understand. Thank you in advance!
*April 24, 2012 by Rose*

**Math Probability**

Using a standard deck of 52 cards find each probability. 1.)King, queen, or black card 2.)Spade or hearts card
*March 14, 2013 by B1nary*

**probability**

Given that there were 4 Heads in the first 7 tosses, find the probability that the 2nd Heads occurred at the 4th toss. Give a numerical answer.
*February 27, 2014 by jon*

**algebra**

Choose a natural number between 1 and 100, inclusive. What is the probability that the number chosen is not a multiple of 5? (Enter the probability as a fraction.) Thank you it is appreciated.
*May 27, 2014 by Mary Ann *

**statistics**

Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F occurs? The hint is to use Demorgan's laws
*September 10, 2014 by rebecca*

**Math : Probability and Standard Deviation**

This is a word problem. "We know that for certain workers the mean wage is $5/hr with a standard deviation of $.50. We need to find out if a worker is chosen at random what is the probability that the workers' wage is between $4.50 and $5.50? Assume a normal distribution of ...
*October 23, 2007 by Tiffany Johnson*

**Statistics/Probability**

5) The product is sold in packets whose masses are normally distributes with mean of 1.42 kg and a standard deviation of 0.025 kg. (1) Find the probability that the mass of a packet, selected at random, lies between 1.37 kg and 1.45 kg
*July 17, 2014 by Koylar*

**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*

**math**

probability... two dice are tossed.... and their sum is recorded ..find probability p ( sum is between 2 and 9)
*August 25, 2010 by tana*

**Probability**

A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?
*October 12, 2010 by vika*

**PROBABILITY**

A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?
*October 19, 2010 by JHONY*

**Probability**

A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?
*October 19, 2010 by JHONY*

**Probability**

A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?
*October 19, 2010 by JHONY*

**PROBABILITY**

A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?
*October 19, 2010 by JHONY*

**Probability **

A pair of fair dice is tossed 3 times. Find the probability a seven appears 3 times.
*February 20, 2011 by Traci*

**Probability**

In a raffle there are four winning tickets from 12, What is the probability from six tickets there are two winners? Thank you in advance.
*May 12, 2012 by William*

**probability**

two dice are tossed. find the probability that the sum is odd given that the sum is 5 or less
*June 12, 2012 by Anonymous*

**statistics**

The probability that a house is burglarized in the city is 5%. If 50 houses are randomly selected, what is the probability that none will be burglarized?
*July 14, 2012 by Sherry*

**math**

empirical probability and theoretical probability of 2 tails - 210 1 tail - 480 0 tail - 310
*April 29, 2014 by yamille *