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A normal population has a mean of 87 and a standard deviation of 7. You select a sample of 49. Use Appendix B.1 for the

A normal population has a mean of 87 and a standard deviation of 7. You select a sample of 49. 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 finalanswers to 4 decimal places.)

a. Less than 86.

Probability

b. Between 86 and 88.

Probability

c. Between 88 and 90.

Probability

d. Greater than 90.

Probability

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