760 Answered Questions for the topic Probability & Statistics

Probability & Statistics

12/18/14

probability
a number smaller than 25 is chosen at random. find the probability of choosing: a factor of 20, an even number or a 7, a number smaller than 15
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Probability & Statistics

12/16/14

What is the probability that the student's alarm clock will not work on the morning of an important final exam
the principle of redundancy is used when system reliability is improved through redundant or backup components. Assume that a student's alarm clock has a 13.4 daily failure rate. 
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Probability & Statistics High School Maths

12/16/14

Statistics - Probability
Sam and Tina both have intentions to a Christmas party. The probability that Sam will go is 0.2. The probability that Tina will go is 0.9 if Sam goes, and 0.3 is Sam does not go.a) What is the... more
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Probability & Statistics

12/06/14

Probability
If you roll 5 six-sided dice what is the probability of rolling only one 6? what is the probability of rolling one or more 6's?   I don't understand how to find the total amount of outcomes much... more
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Probability & Statistics

12/06/14

Thirty-one biased coins are flipped once. The coins are weighted so that the probability..
Thirty-one biased coins are flipped once. The coins are weighted so that the probability of a head with any coin is 0.4. What is the probability of getting at least 16 heads?
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Probability & Statistics

12/03/14

Trying to confront a company regarding defective rates for units.
I have tried to do this myself, but the math escapes me *sigh* I am a forum owner and a company is having serious defective issues. We know that their "claimed" defective rate is WAY off and we... more
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Probability & Statistics

12/01/14

If the odds against an event are 3 to 5, what is the probability of the event occurring?
It's probability
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Probability & Statistics

11/30/14

Assume that blood pressure reading are normally distrubuted withy
Assume that blood pressure reading are normally distrubuted with mean 120. A researcher wishes to select people for a study but wants to exclude the top and bottom 12 percent . What would be the... more
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Probability & Statistics

11/28/14

probability question
1000 tickets are sold for a charity lottery at $5 each. Three numbers are drawn at random to receive 1st 2nd and 3rd place prizes of $2000, $1000, and $500 respectively. what is the mean... more
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Probability & Statistics

11/21/14

An unprepared student randomly guesses the answers to all of the 20
An unprepared student randomly guesses the answers to all of the 20multiple choice questions in an exam. If each question has four possiblechoices, what is the probability that the student scores... more
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Probability & Statistics

11/21/14

A fair die is rolled 360 times.
A fair die is rolled 360 times.(a) What is the expected number (mean) of the number of times a 2 willbe rolled?(b) What is the standard deviation of the number of times a 2 will berolled?
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Probability & Statistics

11/12/14

Find the probability that Jacob’s rolls will result in his having exactly the same score as Rick.
25. Rick andJacobplayagameinwhicheach one rolls two six-sided dice [each die is numbered from one to six]. Rick’s score is the sum of his two rolls. Jacob’s score is three times the lowest number... more
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Probability & Statistics

11/12/14

He has a 6/10 chance of scoring a goal in a game. What are the chances that he won’t score in the game?
2. Cristiano Ronaldo has a 6/10 chance of scoring a goal in a game. He has a 2/10 chance of scoring two goals in a game, and 1/10 chance of scoring a hat trick. A) What are the chances that he... more
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Probability & Statistics

11/11/14

Find the probability of rolling at least 3 even numbers in 7 rolls of six sided die
I need help setting this problem up.
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Probability & Statistics Probability

11/09/14

probability question 13
the probability that a certain comet colliding with a planet is approximately 1.5 x 10^-7 every time their orbits intersect. What is the probability that during 600,000 orbit intersections, at... more
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Probability & Statistics Probability

11/09/14

Probability Question 6
The probability that a part produced by a certain factory's assembly line will be defective is .047. Find the probabilities that in a run of 45 items, the following results are... more
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Probability & Statistics Probability Probability\

11/09/14

Probability Question 7
an experiment consists of dealing 5 cards from a standard 52 card deck what is the probability of being dealt a 10 jack queen king ace all in the same suit? round to 7 decimal places
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Probability & Statistics

11/06/14

Fundamentals of Probability
An inspector has to inspect products from 3 machines in one department, 5 machines in another, and 2 machines in a third. The quality manager wants to vary the inspector's route. How many different... more
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Probability & Statistics Algebra 2 Probability Algebra Help

11/04/14

What is the probability that it will not be green write your answer in a decimal
A box contains 13 red blocks 8 orange blocks 9 green blocks and 10 blue blocks. Anna randomly chooses a block from the box
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Probability & Statistics

11/03/14

Statistics question please....
Some colleges use SAT scores to predict freshmen GPA.A freshmen college class has a mean SAT score of 1217 with a standard deviation of 79. After one semester their GPA was 2.88 with a standard... more
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Probability & Statistics

10/30/14

I can't figure out how to do a probability problem?
Five raffle tickets are sold for a Halloween raffle. Marty buys three of the five raffle tickets. Two of the tickets are to be drawn as winning tickets. What is the probability of Marty not having... more
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Probability & Statistics Statistics

10/29/14

Can anyone please help me in proving the below problem.I am preparing for MS it would be helpful if someone is assisting me
Need to prove the following   (a) If P(A)>P(B), then P(A|B)>P(B|A).(b) If A is independent of B, then A is independent of B'(c) If A is independent of B, then A' is independent of... more
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Probability & Statistics

10/20/14

Concerning two events A and B, the following probabilities are specified:
Concerning two events A and B, the following probabilities are specified:P(A) = .4. P(B) = .3, and P(A [ B) the symbol here between A and B is the union symbol that looks like a u. = .6. What is... more
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Probability & Statistics

10/20/14

Suppose a fair die has its even-numbered faces painted red. (The oddnumbered
Suppose a fair die has its even-numbered faces painted red. (The oddnumberedfaces are white). Consider the experiment of rolling the dieonce and the events:A = [ 2 or 3 shows up ],B = [ Red face... more
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Probability & Statistics

10/20/14

The letters A,B,C,D,E,F, and G are arranged in random order.
3. The letters A,B,C,D,E,F, and G are arranged in random order.(a) What is the probability that A and E are next to each other?(b) What is the probability that A, B, and C appearing in a row in... more
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