A normal population has a mean of 19 and a standard deviation of 4.

a.	Compute thezvalue associated with 23.(Round your answer to 2 decimal places.)

Z

b.	What proportion of the population is between 19 and 23?(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 17?(Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)

Proportion