A normal population has a mean of 20 and a standard deviation of 4, business and finance homework help

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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