A normal population has a mean of 18.5 and a standard deviation of 4. Refer to the table in Appendix B.1. O 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 18.5 and 25.0? (Round z-score computation to 2 decimal places and the final answer to 4 decimal places.) 2:20:48 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 Files decimal places.) Proportion