Question 1197492
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Hi  
 p(deficient in vitamin D) = .30   and P(not) = .7 
n = 310
µ = np = 93
σ = {{{sqrt(npq) = sqrt(65.1)}}} = 8.07  rounded
Using a TI calculator 0r similarly a Casio fx-115 ES plus
P( x  ≤ 79) = .0414 app 

Wish You the Best in your Studies.
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