GRE For Dummies with Online Practice by Ron Woldoff

Author:Ron Woldoff
Language: eng
Format: epub
ISBN: 9781119550815
Publisher: Wiley
Published: 2019-04-30T00:00:00+00:00

The standard deviation of n

The standard deviation of n if each number in n were increased by 5

So the numbers in n increased, but did the distances from the mean change? Probably not, since the mean also increased by 5. Say the numbers were 5, 7, and 9: The mean is 7, and the other two numbers are 2 from the mean. Now up the numbers by 5, for new values of 10, 12, and 14: The mean is now 12, and the other two numbers are still 2 from the mean. The standard deviation didn’t change, and the quantities are equal. Correct answer: Choice (C).

Sometimes you have to compare the standard deviations of a set of graphs, like these:

Graph A:

© John Wiley & Sons, Inc.

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