What formula do I use to solve this problem?

What formula do I use to solve this problem? In a survey of a group of​ men, the heights in the​ 20-29 age group were normally​ distributed, with a mean of 68.7 inches and a standard deviation of 4.0 inches. A study participant is randomly selected. The probability that the study participant selected at random is less than 67 inches tall is? How do I set up the problem to do the calculations to solve?
 
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