A normal population has a mean of 20 and a standard deviation of 5.

a.Compute the z value associated with 24. (Round your answer to 2 decimal places.)

Z=

What proportion of the population is between 20 and 24? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)

Proportion =

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 =