Statistics Question: Calculating percent probability?

The question is: The mean and standard deviation of a normally distributed population are 105 and 2 respectively. Determine the percent probability that a member of the population will have a value between 101 and 104. The answer is supposed to be 28.6% but I can't figure out how to get that answer. Any... show more The question is:

The mean and standard deviation of a normally distributed population are 105 and 2 respectively. Determine the percent probability that a member of the population will have a value between 101 and 104.

The answer is supposed to be 28.6% but I can't figure out how to get that answer. Any help will be appreciated.
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