Question

Calculate mean of the following frequency distribution:

Values	:	60	62	64	67	70	73	77	81	85	89
Frequency	:	54	82	103	176	212	180	115	78	50	21

Answer 1

X	Frequency (f)	fX
60 62 64 67 70 73 77 81 85 89	54 82 103 176 212 180 115 78 50 21	3240 5084 6592 11792 14840 13140 8855 6318 4250 1869
	Σf = 1071	ΣfX = 75980

$\overline{\mathit{X}}=\frac{\Sigma fX}{\Sigma f}=\frac{75980}{1071}=70.94$
Thus, the mean for the given data is Rs 70.94.