Question

Consider the following. (Give your answers correct to two decimal places.)
(a) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3989.


(b) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.4875.


(c) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3628.

Answer 1

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.3989, .4875, .3628) related to your Z scores.

Answer 2

I still do not understand how you get the answer of above or below??

Answer 3

Find the area under the standard normal curve to the left of z = −1.5 and to the right of z = −1.Round your answer to four decimal places, if necessary.