SOLUTION: How many students of 3000 will have an IQ score less than 85 with a mean of 100 and standard deviation of 20?

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Question 435832: How many students of 3000 will have an IQ score less than 85 with a mean of 100 and standard deviation of 20?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

z = -15/20 = -.75   NORMSDIST(-0.75) = .2266 Or 22.66% fall below this

 .2266*3000 = 679.8 or 679 have an IQ score less than 85