815 Answered Questions for the topic Probability & Statistics

Probability & Statistics

11/20/17

Exam question
The probability of the student solving Q1 is 60% . If he solves it the probability of him passing the exam is 80% , if he doesn’t then the probability of failing is 55%.After the exam the student... more
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Probability & Statistics Math Algebra 1 Algebra 2

11/18/17

Question Below! Emergency! Assignment is Due by 3pm
Of the 193 member countries of the United Nations, 54 are in the African Group and 23 are in the Eastern European Group. Suppose that a country is selected at random from the members of the United... more
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Probability & Statistics Math Algebra 1 Probability

11/18/17

Question Below. Emergency! My Assignment is Due by 3pm
A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the... more
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Probability & Statistics Math Algebra

11/17/17

Sets and Counting
Suppose there are three pitchers and three catchers at a baseball training camp. In how many ways can the six players be seated in a row if no one sits next to someone who plays the same position?
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Probability & Statistics

11/16/17

it is approximately 2000 jelly beans in the jar, which is closest to the difference between the number of yellow and green jelly beans?
20% green 25% yellow 15% other 40% red how is the answer 100
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Probability & Statistics

11/15/17

I need a step by step explanation on how to answer the question stated below as soon as possible, thank you!!!
Suppose you are in a room with 7 people. What is the probability that no one shares a birthday? 
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Probability & Statistics

11/15/17

i would like a clear explanation of this problem
A box contains 6 red marbles and 8 blue marbles. If you randomly grab 5 marbles at a time, findthe probability that there will be(i) 3 red. (ii) 4 red. (iii) all red. (iv) none red (v) none blue
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Probability & Statistics Baye's Theorem

11/15/17

Bayes Theorem Help
Tommy is a football player who suffers an injury during the game. The team doctor looks at the injury and tells Tommy that he needs to run some tests and there is only a 20% chance he will... more
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Probability & Statistics

11/08/17

HELP PROBABILITY
5. The random variables X, Y have joint probability density functionf(x, y) = (Ce−x−e−x−2yey−1if x > 0 and y > 0,0 otherwise.(a) What is the value of C?(b) Are X and Y independent?(c) Find... more
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Probability & Statistics Statistics Permutations

11/07/17

Consider the word "BLESSINGS" use these letters ti count math "words". How many ways can we arrange the letters in a sequence?
I was thinking it may be 10!/5! but am not sure
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Probability & Statistics Probability

11/06/17

The returns on US large stocks are normally distributed with the expected return of 9% and standard deviation of 20.5%. Prob of getting negative return is?
I need some help with this question
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Probability & Statistics Probability Probability Problems

11/05/17

Questions about probability (Condition/Binomial random variable)
You have identical 30 balls; 5 black, 10 purple, 15 orange balls in a box.   Q1.If we take a ball, we make a mark on it and put it back to the box. We take one ball at a time. What is the... more
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Probability & Statistics

11/04/17

If I have 8 lions, 2 monkeys, 4 giraffes and 6 lepoards what is the probability of picking one animal and it being a monkey?
Need help please. 
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Probability & Statistics

11/04/17

statement is true
Which of the following statements is TRUE?  A. If all of the data values in a data set are identical, then the standard deviation is 1. B. The variance is one of the measures indicating... more
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Probability & Statistics

11/03/17

Probability Curve
Scores on the SAT form a normal distribution with an average of 500 and a standard deviation of 100. Based on this information, what percent of scores fall above an SAT score of 520?
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Probability & Statistics

11/03/17

16. Fifteen people work in an office. 8 are women and 7 are men. The flu virus is coming. (a) In how many ways can the flu virus randomly select 9 workers out
hard time with this one
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Probability & Statistics

11/03/17

The mean reaction time of 1500 randomly selected students who took SHOVITALLTM anti- math anxiety medication was measured at 12 minutes, with a standard deviati
The mean reaction time of 1500 randomly selected students who took SHOVITALLTM anti- math anxiety medication was measured at 12 minutes, with a standard deviation of 2 minutes. Assuming a normal... more
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Probability & Statistics

11/03/17

9. Find the equation of the line passing through (3, 1) and (4, – 1): A. 5x–4y= 11 B. 2x+5y = 3 C. 2x+y = 7 D. 3x+4y = 8
need assistance with multiple ??
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Probability & Statistics Probability

11/03/17

Tchebysheff's Theorem
Let Y be a random variable with p = 10 and o2 = 4. Use Tchebysheff’s theorem to find a) A lower bound for P(6 < Y < 14)b) The value of C for which P(IY – 10I greater or equal to C) less than... more
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Probability & Statistics Odds

11/01/17

There are 100 numbers listed. What are the odds that if 10 numbers are selected, that at least one is 20 or less?
It's a probability question that I can't seem to figure out.
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10/30/17

There is total batch of 100 products. 10 of the products are faulty. 2 products are taken randomly
There is total batch of 100 products. 10 of the products are faulty. 2 products are taken randomly from the batch without replacement for them. Variable X is the total number of faulty products... more
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Probability & Statistics

10/29/17

find the random variable x has a poisson distribution with mean u=6, find the probability that x=2
find the random variable x has a poisson distribution with mean u=6, find the probability that x=2
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Probability & Statistics Elementary Statistics

10/27/17

Question in description
Question Help A candy company that makes colored candies claims that 10% of the candies it produces are green and that bags are packed randomly. In a really large bag of candies, we found 12% of... more
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Probability & Statistics

10/25/17

Probability and Stats
There are 49 even numbers from 1 to 99. The mean of 48 of these numbers is 49 and 5/12. Which even number was not included in the calculating of this mean?
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Probability & Statistics

10/25/17

Probability and Stats
You are offered a chance to play a game. The rules are simple. There are 100 cards, face down. Fifty-five of the cards say "win" and 45 of the cards say "lose." You begin with a bankroll of... more
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