The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of .2 inches. What is the probability that a sheet selected at random from the population is between 29.75 and 30.5 inches long?
A) .4332
B) .4878
C) .0546
D) .9210

Question

Quizplus · Accepted Answer

P(−1.5 ≤ z ≤ 0) = .5 − .0668 = .4332
P(0 ≤ z ≤ 2.25) = .9878 − .5000 = .4878
.4332 + .4878 = .921

The Population of Lengths of Aluminum-Coated Steel Sheets Is Normally