Posted by **gio** on Friday, February 18, 2011 at 10:09pm.

a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following:

a) prob that he will guess all of them right

b)prob that he will guess at most 12 right

c) prob that he will guess at least 1 right

d) mean and stndrd. deviation of the number of correct answers

e)estimate the prob of the number of correct answers that will fall within the limits -----> miu +or- 2(stand.dev)

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