A normal population has a mean of 78 and a standard deviation of 9. You select a sample of 57. Use Appendix B.1 for the z-values.
Compute the probability that the sample mean is: (Round the z-values to 2 decimal places and the final answers to 4 decimal places.)
a. Less than 77.
b. Between 77 and 79.
c. Between 79 and 81.
d. Greater than 81.
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