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mehravikas
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Please search before posting.. this has been answered several times...mehravikas wrote:Clueless on this one.
Gmat Prep - Standard deviation and mean
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Source: Beat The GMAT — Problem Solving |
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sudhir3127
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mim3
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[quote="mehravikas"]Clueless on this one.[/quote]
We know that the difference in the two scores is 40 and there are 5 SD's between them. Divide to find the amount of 1 SD: 40/5= 8. Because it's known that 58 is 2 SD's below the mean add 16 to 58 to get the answer, 74.
We know that the difference in the two scores is 40 and there are 5 SD's between them. Divide to find the amount of 1 SD: 40/5= 8. Because it's known that 58 is 2 SD's below the mean add 16 to 58 to get the answer, 74.
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jeffxujian
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ur way is so coolmim3 wrote:We know that the difference in the two scores is 40 and there are 5 SD's between them. Divide to find the amount of 1 SD: 40/5= 8. Because it's known that 58 is 2 SD's below the mean add 16 to 58 to get the answer, 74.mehravikas wrote:Clueless on this one.
i set SD as variable X and two condition given in the question, can thus be derived into 2 equations
M-2X=58
M+3x=98
X = 8, therefore, M-Mean=74
