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Scores on a recent national statistics exam

Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.

A. What is the probability that a randomly selected exam will have a score of at least 71?

B. What percentage of exams will have scores between 89 and 92?

C. If the top 2.5% of test scores receive merit awards, what is the lowest score eligible for an award?

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