744 Answered Questions for the topic Probability & Statistics

Probability & Statistics

08/03/15

An unfair coin comes up heads 56.9% of the time. The coin is flipped a total of 27 times.
What is the probability that you get AT MOST 25 heads?   p=0.569 1-p = 0.431 n = 27
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Probability & Statistics

08/03/15

Probability question
An exam has 39 questions on it and students need to answer 26 of the questions.  In how many ways can this be done if the first 5 questions and exactly 6 of the last 8 questions must be answered... more
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Probability & Statistics Algebra 2 Statistics Probability

08/02/15

the teacher of a mathematics exam has written up a final exam but wants the questions to be random for each student.
There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully reading the scenario, determine the number of different final... more
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Probability & Statistics

07/21/15

probability
The percentage of the general population that has each blood type is shown in the following table.  Determine the probability distribution associated with these data.   Blood Type -     ... more
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Probability & Statistics

07/14/15

Find the expectation of the game.
If a player rolls two dice and gets a sum of 2 or 12, she wins $20. If the person gets a 7, she wins $5. The cost to play the game is $3. Find the expectation of the game.
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Probability & Statistics

07/06/15

A box contains 5 green hats and 4 blue hats and 3 hats are randomly selected from the box. Find the probability that at least one hat is blue.
These problems are usually easy, but I am totally blanking on this. I've tried a handful of ways and got it wrong.
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Probability & Statistics Statistics

06/30/15

please help!!!
Out of all of the 2010 murder cases, 28.8% killed by family members, 53% by acquaintance and the remainder by stranger. What's probability that a randomly selected murder victim was killed by... more
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Probability & Statistics Statistics Question

06/30/15

please help!
In a recent survey, 15 people preferred milk, 27 people preferred coffee and 18 peoplepreferred juice as their primary drink for breakfast. If a person is selected at random, find theprobability... more
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Probability & Statistics

06/27/15

What is the probability of rolling a 4 on a ten sided die 5 times in a row?
What is the probability of rolling a 4 on a ten sided die 5 times in a row? I don't think the answer is as simple as 1 in 10,000 which would be a ten percent chance 5 times. 
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Probability & Statistics Math Statistics Probability

06/20/15

Probability Help!
1. Use the frequency distribution to find the expected value (mean), variance, and the standard deviation. Number of downloads (X) 27 28 30 31 32 Probability (P(X)) 0.15 0.2 0.3 0.25 0.1   2. You... more
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Probability & Statistics Math Statistics Probability

06/20/15

Probability!! 2
Thanks!   2. You have $10,000 to invest. After some investigating, you found two investment opportunities. Bond A has a return of 6.5% with a default rate of 2%. Bond B has a return of 8% with a... more
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Probability & Statistics Probability Problems

06/17/15

What is your expected value?
In a game you bet $1 and toss two coins. If two heads come up, you win a profit of 75 cents. If two tails come up, no one wins anything. Otherwise, you lose your dollar. What is your expected value... more
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Probability & Statistics Probability Problems

06/17/15

What is the expected cost to the company of a batch of 3000 tires?
A company manufactures tires at a cost of $40 each. The following are probabilities of defective tires in a given production run: probability of no defective tires: 10%; probability of 1% defective... more
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Probability & Statistics

06/16/15

If there are 100 different flavors, how many possible mixtures can be created?
If I have 100 different flavors, how many possible different flavors can be created?
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Probability & Statistics Finite Mathematics Bernoulli Trials

06/15/15

Bernoulli Principle
A certain drug was developed, tested, and found to be effective 80% of the time. Find the probability of successfully administering the drug to at least 10 out of 11 patients. (Round your answer to... more
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Probability & Statistics Math Probability Math Help

06/15/15

probability, binomial experiment
According to a report of the Nielsen company 65% of internet searches in may 2010 used the google search engine. assume that a sample of 20 searches is studied.    a) what is the probability that... more
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06/15/15

binomial experiment, probability
according to a report of the Nielsen company 65% of internet searches in may 2010 used the google search engine. Assume that sample of 20 searches is studied.   a) What is the probability that... more
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Probability & Statistics

06/14/15

A fair dice is rolled 8 times. what is the probability that you will get OVER five sixes
 hdhflhvjhvlv;kv;kv;kjb;v;khvkhv
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Probability & Statistics

06/12/15

An experiment selecting a student body president and vice president. All undergraduate students (freshmen through seniors) are eligible for these offices.
An experiment consists of selecting a student body president and vice president. All undergraduate students (freshmen through seniors) are eligible for these offices. How many sample points... more
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Probability & Statistics

06/11/15

determine P(F or G) by using the general addition rule
a probability experiment is conducted in which the sample space of the experiment is S={1,2,3,4,5,6,7,8,9,10,1112} event F={4,5,6,8} and Event G={10,11,12}. assume the outcome of each is equally... more
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Probability & Statistics Algebra 1 Probability

06/09/15

Find the standard deviation of the data set below. Round your answer to three decimal places.
3,5,7,7,9,11,12,13,15,17,18,19,19,19
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Probability & Statistics Algebra 1 Probability Word Problem

06/09/15

James has 33 coins in his pocket, all of them nickels and quarters. If he has a total of $2.25, how many quarters does he have?
James has 33 coins in his pocket, all of them nickels and quarters. If he has a total of $2.25, how many quarters does he have?
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Probability & Statistics

06/09/15

A thief steals an ATM card and must randomly guess the correct 4 digit pass code from a 9-Key key pad. Repetition Is allowed. What is the probability of a corre
I don't know what formula to use for this question 1/9 to the 9th power is way to large of a number.n where did i go wrong?
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Probability & Statistics Statistics Probability Statistics Question

06/06/15

Finding Probabilities
Let z be a standard normal random variable. Find P(0.48 < z < 2.3 and z > 1.9).   I tried to do them both separately and then putting them together but I ended up with the wrong answer.... more
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Probability & Statistics

06/04/15

with 90% confidence, how many dice rolls should I take so that I get at least one of each faces of the dice?
I want to know how long it would take me to get at least one of each of the dice's face. 
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