The High Temperature X (In Degrees Fahrenheit) on January Days

Multiple Choice

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio, varies according to the Normal distribution with mean 21 and standard deviation 10. The value of P(X < 10) is:

A) 0.7433.
B) 0.8643.
C) 0.1357.
D) 0.