Question

Find the percent of area under a normal curve between the mean and the given number of standard deviations from the mean.​ (Note that positive indicates above the​ mean, while negative indicates below the​ mean.)

0.90

_% round to the nearest tenth

Answer 1

The percentage of area under a normal curve between the mean and the  standard deviations is 81.59%

What is z score?

Z score is used to determine by how many standard deviations the raw score is above or below the mean. It is given by:

z = (raw score - mean) / standard deviation

Hence:

P(z < 0.9) = 0.8159

The percentage of area under a normal curve between the mean and the  standard deviations is 81.59%

Find out more on z score at: https://brainly.com/question/25638875