Question 1175039
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Hi
Normal Distribution:    μ = 30.23  and  σ = 13.84  
Your Question did not make the trip:

This is one example using TI Calculator for You to follow.
 P(x ≤ 40) = normalcdf(-9999, 40, 13.84, 30.23) = .7599

One could also Use a Casio fx-115ES plus ... inexpensive and easy to use 
Wish You the Best in your Studies.
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