Probability that a 60 year old male has BMI less than 41?

Text: Using similar logic and the fact that approximately 95% of the area under the curve lies between the mean plus or minus two standard deviations (i.e., P(29 < X < 41) = P(17 < X < 29) = 0.475), we can compute P(X < 41) = 0.5 + 0.475 = 0.975.