A normal population has a mean of $22$ and a standard deviation of $5.$

Required:

$1\mathrm{.}5$ points

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a$.$ Compute the $z$ value associated with $25.$ Note: Round your answer to $2$ decimal places.

b$.$ What proportion of the population is between $22$ and $25?$ Note: 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 $18?$

Note: Round $z-$score computation to $2$ decimal places and your final answer to $4$ decimal places.

Proportion