Mary's Final for Psychology has 10 True/False questions and 10 multiple choice questions with 4 choices...

Mary's Final for Psychology has 10 True/False questions and 10 multiple choice questions with 4 choices for each answer. Assuming Mary randomly guesses on every question:

a.) What's the probability that she gets at least 6 of the 10 true/false questions correct?

b.) What's the probability that she gets at least 6 of the 10 multiple choice questions correct?

c.) If the multiple choice questions had 5 choices for answers instead of 4, what's the probability that she gets at least 6 of the 10 multiple choice questions correct?

Expert Solution

orchestra answered 2 years ago

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