The mean of n observations is x1. If the first observation is increased by 1, second by 2, and so on, then their mean is x2 . The value of x2 - x1 is
The mean of n observations is x1. If the first observation is increased by 1, second by 2, and so on, then their mean is x2 . The value of x2 - x1 is
An
B$\frac{n}{2}+1$
C$\frac{n \times (n+1)}{2}$
D$\frac{(n+1)}{2}$
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