Locating Percentiles under the Normal Curve. Solve the following question.

Question

Locating Percentiles under the Normal Curve. Solve the following question. (Show Solution)

1.) Find the 99th percentiles of a normal curve.

2.) Find the 40th percentiles of a normal curve.

Answer 1

99th percentile is about 2.326 standard deviations above the mean

40th percentile has z score -0.253, which means 0.253 standard deviation below the mean

about 1/4 of a standard deviation below the mean

use a z calculator

if the mean =0 and standard deviation =1, then for a normal distribution

99th percentile is a score of 2.326

40th percentile is a score of -0.253