If the random variable X is normally distributed, with a mean of 75 and a standard deviation of 8, which of the following values is the probability that X is greater than or equal to 75?
A) 0.125
B) 0.500
C) 0.625
D) 0.975

Question

Quizplus · Accepted Answer

The area under a normal distribution curve to the right of the mean (in this case, 75) is always 0.5 or 50%. Therefore, the best choice is B, which represents a probability of 0.5.

If the Random Variable X Is Normally Distributed, with a Mean