If X is a normal random variable with mean of 1228 and a standard deviation of 120,the number of standard deviations from 1228 to 1380 is:
A)10.233
B)3.1989
C)11.50
D)1.267

Question

Quizplus · Accepted Answer

The number of standard deviations from the mean to a given value is calculated by subtracting the mean from the value and then dividing by the standard deviation. For this case, (1380 - 1228) / 120 = 152 / 120 = 1.267.

If X Is a Normal Random Variable with Mean of 1228