If the variance of 3+x, 6, 4, x and 7-x is 4 and the mean is 5, find the standard deviation
- \(\sqrt{3}\)
-
2
- 3
- \(\sqrt{2}\)
The correct answer is: B
Explanation
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
There is an explanation video available .