9. Human body temperatures are normally distributed with a mean of 98.20° F and a standard deviation of 0.62° F. If 20 people are randomly selected, the probability that their mean body temperature...

9. Human body temperatures are normally distributed with a mean of 98.20° F and a standard  deviation of 0.62° F. If 20 people are randomly selected, the probability that their mean body  temperature will be less than 99° F is

(A)
0.673
(B)
0.822
(C)
0.901
(D)
0.663

If you feel the answer is none of the choices given, submit no answer to the question.