My Math Forum Exercise in Probability!!!!

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 April 13th, 2013, 02:17 PM #1 Member   Joined: Apr 2013 Posts: 52 Thanks: 0 Exercise in Probability!!!! Hey!!! I need some help at the following exercise... We have a box with balls and 10% of them are red. If we choose at random 20 balls with replacement, which is the probability to pick more than 3 red balls??? Thanks in advance!!!
 April 13th, 2013, 03:22 PM #2 Member   Joined: Apr 2013 Posts: 52 Thanks: 0 Re: Exercise in Probability!!!! Hey!!! I need some help at the following exercise... We have a container that contains r balls that have numbers 1,...,r. We choose at random n of them without replacement. Let Y be the greatest and Z the smallest of the numbers of the balls we chose. Which are the probabilities P(Y<=y) and P(Z>=z)??? Thanks in advance!!!
April 13th, 2013, 03:23 PM   #3
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Re: Exercise in Probability!!!!

Quote:
 Originally Posted by evinda Hey!!! I need some help at the following exercise... Thanks in advance!!!

 April 13th, 2013, 03:24 PM #4 Member   Joined: Apr 2013 Posts: 52 Thanks: 0 Re: Exercise in Probability!!!! Sorrry!!!!!!!!!!!Accidentally I posted two exercises....I meant only the second one....

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