A Certain University Maintains a Colony of Male Mice for Research

Multiple Choice

A certain university maintains a colony of male mice for research purposes. The ages of the mice are normally distributed with a mean of 60 days and a standard deviation of 5.2. Assume you randomly sample one mouse from the colony. The probability his age will be less than 45 days is _________.

A) 0.9980
B) 0.4980
C) 0.0020
D) 0.0019