A normal population has a mean of 18.4 and a standard deviation of 3.2. Refer to the table in Appendix B.1.

a. Compute the z-value associated with 25.0. (Round the final answer to 2 decimal places.)

z =

b. What proportion of the population is between 18.4 and 25.0? (Round z-score computation to 2 decimal places and the final answer to 4 decimal places.)

Proportion

c. What proportion of the population is less than 18.0? (Round z-score computation to 2 decimal places and the final answer to 4 decimal places.)

Proportion