Question
Asked Feb 20, 2020
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I'm not understanding how the textbook came up with this answer:

Question: Under what circumstances would a score that is 15 points above the mean be considered an extreme score?

a. When the mean is much larger than 15

b. When the standard deviation is much larger than 15

c. When the mean is much smaller than 15

d. When the standard deviation is much smaller than 15. 

I knonw the answer is "d" but I would like to understand why. 

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It is given that the when the standard deviation is much smaller than 15 the...

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