Check my 4 A normal population has a mean of 18 and a standard deviation of 5. a. Compute the z value associated with 24. (Round your answer to 2 decimal places.) Z 00:43:05 b. What proportion of the population is between 18 and 24? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Proportion c. What proportion of the population is less than 13? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Proportion