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Student scores on Professors' Stats final exam are normally distributed with a mean of 72 and...

Student scores on Professors' Stats final exam are normally distributed with a mean of 72 and a standard deviation of 6.9

Find the probability of the following:

**(use 4 decimal places)**

a.) The probability that one student chosen at random scores above an 77.

b.) The probability that 20 students chosen at random have a mean score above an 77.

c.) The probability that one student chosen at random scores between a 67 and an 77.

d.) The probability that 20 students chosen at random have a mean score between a 67 and an 77.

Math   Statistics-And-Probability   
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