Question

The variance of the data $x_1,x_2,...,x_{30}$ with $\displaystyle\sum^{50}_{i=1}x_i=650$ and $\displaystyle\sum^{50}_{i=1}x_i^2=10000$ is

• A. 30
• B. 40
• C. 39
• D. 41
• E. 31

Answer 1

Answer: (E)

31

Answer 2

The correct option is (E): 31