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The average score on an exam was reported as 61% with a standard deviation of 16%....

The average score on an exam was reported as 61% with a standard deviation of 16%. You may assume exam scores are normally distributed. If I select 10 people at random, what is the probability that the average of their scores would be …

(A) …more than 50%?

(B) …between 70% and 85%?

math   Statistics-And-Probability   
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