Question

If there are $N$ individual observations $X1,X2,....Xn$, Arithmetic mean $=$?

• A. $\overline{X}=\frac{X_1\times X_2\times X_3\times ......X_n}{N}$
• B. $\overline{X}=\frac{X_1+X_2+X_3+......X_n}{N}$
• C. $\overline{X}\frac{\sum X_i}{N}$
• D. (B) or (C)

Answer 1

The correct option is B $\overline{X}=\frac{X_1+X_2+X_3+......X_n}{N}$

$\overline{X}=\frac{X_1+X_2+X_3+......X_n}{N}=\frac{\sum X}{N}$
This is the direct method of calculating arithmetic mean.