SOLUTION: Recent research indicated that about 30​% of children in a certain country are deficient in vitamin D. A company that sells vitamin D supplements tests 310 elementary school chil

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Question 1197492: Recent research indicated that about 30​% of children in a certain country are deficient in vitamin D. A company that sells vitamin D supplements tests 310 elementary school children in one area of the country. Use a Normal approximation to find the probability that no more than 79 of them have vitamin D deficiency.
The probability is approximately?
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!

Hi  
 p(deficient in vitamin D) = .30   and P(not) = .7 
n = 310
µ = np = 93
σ =  = 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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