Question 1176511
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Hi
Normal Distribution:    μ = 215 mg/dl and    σ = 25 mg/dl 

Using Ti or similarly an inexpensive like a Casio fx-115 ES plus:
 
 P( 227.5 < x < 240) = normalcdf(227.5, 240, 25, 215) = .1499

Wish You the Best in your Studies.
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