91Ó°ÊÓ

Use Table II to obtain the areas under the standard normal curve.

Determine the area under the standard normal curve that lies to the left of$-0.87$

Because the given quantity $-0.87$is negative, the conventional normal table of negative $z$scores is applied. To begin, travel down the right-hand column called $\text{'}Z\text{'}$to $-0.8$and then across the row to the column labeled $\text{'}0.07\text{'}$to get $0.1922.$

As a result, the region beneath the standard normal to the left of $-0.87$is $0.1922$.

Use Table II to obtain the areas under the standard normal curve.

Determine the area under the standard normal curve that lies to the left of$3.56$

Because the given number $3.56$is positive, the typical normal table of positive $z$scores is employed.

To begin, proceed down the left hand column labeled' $z$to $3.5$and then across the row to the column labeled' $0.06$to get $0.9998$.

As a result, the region beneath the ordinary normal to the left of $3.56$is $0.9998$.

Use Table II to obtain the areas under the standard normal curve.

Determine the area under the standard normal curve that lies to the left of$5.12$

Because the given quantity $5.12$is positive, the typical normal table of positive $z$scores is employed. To begin, travel down the left hand column labeled' $\text{'}z\text{'}$to $5.1$and then across the row to the column labeled $0.02$to get $1.0000$

As a result, the area beneath the usual normal to the left of $5.12$is $1.0000$.