A Normal Distribution Has Mean $\mu$ =60 and Standard Deviation $\sigma$ =20 Find and Interpret the Z-Score for X=90

question 54

Multiple Choice

A normal distribution has mean $\mu$ =60 and standard deviation $\sigma$ =20 . Find and interpret the z-score for x=90.

• A) z=-1.50 : a value of 90 is 1.50 standard deviations below the mean.
• B) z=10 : a value of 90 is 10 standard deviations below the mean.
• C) z=1.50 : a value of 90 is 1.50 standard deviations above the mean.
• D) z=2.25 : a value of 90 is 2.25 standard deviations above the mean.

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