bkiage12 bkiage12

05-05-2017
Mathematics

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a set of 1000 values has a normal distribution. The mean of the data is 120 and the standard deviation is 20

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BlueSky06 BlueSky06

19-05-2017

In order to find 90%, you need to look for 90% on a normal distribution curve, which has a z-score of 1.29.

The solution would be like this for this specific problem:

-120 / 20 = 1.27

You would require 145.4 and 90% lie under that point.

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