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April 13th, 2013, 02:17 PM   #1
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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!!!
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April 13th, 2013, 03:22 PM   #2
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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!!!
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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!!!
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April 13th, 2013, 03:24 PM   #4
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Re: Exercise in Probability!!!!

Sorrry!!!!!!!!!!!Accidentally I posted two exercises....I meant only the second one....
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