2013
Mathematics
JAMB
If the variance of 3+x, 6, 4, x and 7-x is 4 and the mean is 5, find the standard deviation
A.
√3
B.
2
C.
3
D.
√2
Correct Answer: 2
Explanation
Let δ2 and δ denote the variance and standard deviation of the distribution respectively. But δ2 = 4 (given) Hence δ = √4 = 2
Let δ2 and δ denote the variance and standard deviation of the distribution respectively. But δ2 = 4 (given) Hence δ = √4 = 2THIS WEEK's
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