SOLUTION: Could someone please explain the formula for finding the 70th percentile if the mean is 2.9 and there is a standard deviation of 0.6?
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Question 1027772: Could someone please explain the formula for finding the 70th percentile if the mean is 2.9 and there is a standard deviation of 0.6? Answer by solver91311(24713) (Show Source):
Look up the Z value in your Normal Distribution table that corresponds to a probability of 70%, plug that number in along with your mean and standard deviation, and do the arithmetic.
If you have Excel, you can type in: =NORM.S.INV(.7) to get the 70th percentile Z score. Or you could type in =NORM.INV(.7,2.9,.6) and get the value of directly.
John
My calculator said it, I believe it, that settles it
