Table1.

Calculation of Dixon method

Row	Number of people	Min	Max
1	3-7	$\tau =\frac{x_2-x_1}{x_n-x_1}$	$\tau =\frac{x_n-x_{n-1}}{x_n-x_1}$
2	8-10	$\tau =\frac{x_2-x_1}{x_{n-1}-x_1}$	$\tau =\frac{x_n-x_{n-1}}{x_n-x_2}$
3	11-13	$\tau =\frac{x_3-x_1}{x_{n-1}-x_1}$	$\tau =\frac{x_n-x_{n-2}}{x_n-x_2}$
4	14-30	$\tau =\frac{x_3-x_1}{x_{n-2}-x_1}$	$\tau =\frac{x_n-x_{n-2}}{x_n-x_3}$