SOLUTION: if the height(X) of the college students are normally distributed with mean 69 and variance 9.find the prob. that X<65.

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Question 1150109: if the height(X) of the college students are normally distributed with mean 69 and variance 9.find the prob. that X<65.
Answer by VFBundy(438) About Me  (Show Source):
You can put this solution on YOUR website!
If the variance is 9, the standard deviation (SD) is the square root of the variance. So, the SD is 3.

%28x+-+mean%29%2FSD = %2865+-+69%29%2F3 = -4/3 = -1.33

Go to a z-table and find the value where the z-score is -1.33. The value is 0.0918.

This means there is a 0.0918 probability that X<65.