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14 Jul 2009, 19:48
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B
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If the standard deviation of Set Y is 4, what is the range of scores that fall within one standard deviation?
(1) The median of Set Y is 5.
(2) The mean of Set Y is 6.
(1) The median of Set Y is 5.
(2) The mean of Set Y is 6.
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15 Jul 2009, 20:58
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I agree with you. But my concern is that we dont need either of the statements to come to the conclusion that range is 8. We are given that std dev is 4 in the question. So obviosuly the first standard dev has scores that fall within a range of 8. So we dont either of the stmts to answrt the question....
Example we are told mean is 6. So first std dev has scores ranging from 2 (6-4) to 10 (6+4).
Example 2. Lets say we are told mean is 20. So first std dev has scores ranging from 16 (20-4) to 24 (20+4)
In either case, the range is always going to be 8.Am I correct? Can somebody explain why we need statement B?
Example we are told mean is 6. So first std dev has scores ranging from 2 (6-4) to 10 (6+4).
Example 2. Lets say we are told mean is 20. So first std dev has scores ranging from 16 (20-4) to 24 (20+4)
In either case, the range is always going to be 8.Am I correct? Can somebody explain why we need statement B?
