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A study shows that scores on an aptitude test are normally

A study shows that scores on an aptitude test are normally distributed with a mean of 70 and a standard deviation of 12. Find the following probabilities:

a) If one test taker is selected, that the person scored greater than 75.
b) If 9 test takers are selected, that person scored greater than 75
c) If 49 test takers are selected, that they have a mean score greater than 75.

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Applied Statistics: A study shows that scores on an aptitude test are normally

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