February 21, 2017

Homework Help: Probability/Statistics

Posted by Amy on Saturday, July 11, 2009 at 2:30pm.

A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %.

I'm not sure what to do. I figured that there's 10 questions, each with a 1/4 chance. I took 10*1/4=2.5 and multiplied that by .70, but my answer wasn't right. What am I missing?

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