If X̅ is the mean of x1, x2, x3, ...xn, then for a ≠ 0, the mean of (ax1, ax2, ax3, ... axn, \(\rm\frac{x_{1}}{a}, \frac{x_{2}}{a}, \frac{x_{3}}{a}, \ldots \frac{x_{n}}{a}\) is:
1
\(\left(a+\frac{1}{a}\right) \bar{X} \)
2
\(\frac{1}{2}\left(a+\frac{1}{a}\right) \bar{X} \)
3
\(\left(a+\frac{1}{a}\right) \frac{\bar{X}}{n} \)
4
\(\left(a+\frac{1}{a}\right) \frac{\bar{X}}{2 n} \)