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The mean of a population is 76 and the standard deviation is 13. The shape of...

The mean of a population is 76 and the standard deviation is 13. The shape of the population is unknown. Determine the probability of each of the following occurring from this population.

a. A random sample of size 36 yielding a sample mean of 78 or more
b. A random sample of size 120 yielding a sample mean of between 75 and 79
c. A random sample of size 219 yielding a sample mean of less than 76.7

(Round all the values of z to 2 decimal places and final answers to 4 decimal places.)

a. ?

b. ?

c. ?

Math   Statistics-And-Probability   
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