q3

A normal population has a mean of 20.0 and a standard deviation of 4.0. a. Compute the z-value associated with 25.0. (Round your answer to 2 decimal places.) b. What proportion of the population is between 20.0 and 25.0 ? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) c. What proportion of the population is less than 18.0 ? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)