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Scores on a certain test are normally distributed with a mean of 77.5 and a standard...

Scores on a certain test are normally distributed with a mean of 77.5 and a standard deviation 9.3.

a) What is the probability that an individual student will score more than 90?

b) What proportion of the population will have a score between of 70 and 85?

c) Find the score that is the 80th percentile of all tests.

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