Assume z is a standard normal random variable. Then P(1.05 ≤ z ≤ 2.13) equals _____.
A) .8365
B) .1303
C) .4834
D) None of the answers is correct.

Question

Quizplus · Accepted Answer

The probability P(1.05 ≤ z ≤ 2.13) is found by calculating the area under the standard normal curve between z = 1.05 and z = 2.13. Using standard normal distribution tables or a calculator, P(z ≤ 2.13) ≈ 0.9834 and P(z ≤ 1.05) ≈ 0.8531. Therefore, P(1.05 ≤ z ≤ 2.13) = 0.9834 - 0.8531 = 0.1303.

Assume Z Is a Standard Normal Random Variable