A normal population has a mean of 77 and a standard deviation of 8. You select a sample of 36. 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 74. Probability b. Between 74 and 80. Probability c. Between 80 and 81. Probability d. Greater than 81. Probability
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