Question

The frequency distribution table is given here.

$x_i$	140	145	150	155	160	165	170	175
$f_i$	4	6	15	30	36	24	8	2

find the $S.D$.

• A. $7.26$
• B. $7.36$
• C. $7.16$
• D. $7.56$

Answer 1

Answer: (A)

$S.D.=\sqrt{\text{Varience}}$
$=\sqrt{52.7136}$
$=\mathrm{7.26.}$