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Asked Oct 31, 2019
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Use the standard normal distribution (aka z distribution where mu = 0 and sigma = 1) to determine the values of Z that will give you the middle 90% of the data.

Note that each answer above requires TWO values of Z. 

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The formula for the values of Z that will give...

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P(-z <Z<z)=P(Z<z)-P(Z<-z)

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