The probability that a randomly selected case will have a score beyond ± 1.00 standard deviation of the mean is________.
A) 0.6826.
B) 0.5000.
C) 0.3174.
D) 1/2 of the area of 1 standard deviation.

Question

Quizplus · Accepted Answer

The area within ± 1.00 standard deviation of the mean is 68.26%, therefore the area beyond ± 1.00 standard deviation is 31.74%. Therefore, the probability that a randomly selected case will have a score beyond ± 1.00 standard deviation of the mean is 0.3174.

The Probability That a Randomly Selected Case Will Have a Score