| A normal population has a mean of 20 and a standard deviation of 4. |
| a. | Compute the z value associated with 25. (Round your answer to 2 decimal places.) |
| Z |
| b. |
What proportion of the population is between 20 and 25? (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 18? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) |
| Proportion |
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