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06 Dec 2016, 11:12
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90% (00:41) correct
10%
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If a certain sample of data has a mean of 15 and a standard deviation of 2, which of the following is not within 2 standard deviations?
A. 10
B. 12
C. 16
D. 18
E. 19
A. 10
B. 12
C. 16
D. 18
E. 19
07 Dec 2016, 01:26
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If a data distribution is normal then the 68% data values are within one standard deviation of the mean (i.e., μ ± σ), and about 95 percent are within two standard deviations (μ ± 2σ).
Here, mean = 15 and standard distribution is 2.
Numbers which are within two standard distribution will be in the range of 15±(2*2) i.e. 11 to 19.
Only only which does not follow this range is 10, i.e. Answer A.
Here, mean = 15 and standard distribution is 2.
Numbers which are within two standard distribution will be in the range of 15±(2*2) i.e. 11 to 19.
Only only which does not follow this range is 10, i.e. Answer A.
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07 Dec 2016, 02:52
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Bunuel
One SD= mean-SD to mean + SD.
here we have SD=2
so one SD range will be 13 to 17
two SD range will be 11 to 19
only value that do not fall under this is 10.Hence A.
