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March 28, 2015

Homework Help: statistics

Posted by please help me! on Tuesday, March 23, 2010 at 2:21pm.

A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question.

1) What is the probability of getting exactly 9 correct answers?

2)What is the probability of getting less than 9 correct answers?

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