If the variance of 3 x 6 4 x and 7-x is 4 and t... - JAMB Mathematics 2013 Question
If the variance of 3+x, 6, 4, x and 7-x is 4 and the mean is 5, find the standard deviation
A
\(\sqrt{3}\)
B
2
C
3
D
\(\sqrt{2}\)
correct option: b
Let (\delta^2) and (\delta) denote the variance and standard deviation of the distribution respectively.
But (\delta^2) = 4 (given)
Hence (\delta) = (\sqrt{4}) = 2
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