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Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73...

Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73 and a standard deviation of 6.5

Find the probability of the following:

**(use 4 decimal places)**

a.) The probability that one student chosen at random scores above an 78.

b.) The probability that 20 students chosen at random have a mean score above an 78.

c.) The probability that one student chosen at random scores between a 68 and an 78.

d.) The probability that 20 students chosen at random have a mean score between a 68 and an 78.

Math   Statistics-And-Probability   
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