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December 19, 2014

December 19, 2014

Posted by **Collie** on Wednesday, October 3, 2012 at 8:33pm.

(a) What is the probability that he will answer all questions correctly?

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(b) What is the probability that he will answer all questions incorrectly?

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(c) What is the probability that he will answer at least one of the questions correctly? Compute this probability two ways. First, use the rule for mutually exclusive events and the probabilities shown in the binomial probability distribution table.

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Then use the fact that P(r ≥ 1) = 1 − P(r = 0).

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Compare the two results. Should they be equal? Are they equal? If not, how do you account for the difference?

They should not be equal, but are equal. They should be equal, but may not be due to table error. They should be equal, but may differ slightly due to rounding error. They should be equal, but differ substantially.

(d) What is the probability that Richard will answer at least half the questions correctly?

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