Question

Find the mean of the following distribution:

x	10	30	50	70	89
f	7	8	10	15	10

Answer 1

Calculation of Mean:

`x_i`	`f_i`	`f_ix_i`
10	7	70
30	8	240
50	10	500
70	15	1050
59	10	890
	`sumf_i` = N = 50	`sumf_ix_i` = 2750

∴ Mean = `(sumf_ix_i)/"N"`
= `(2750)/(50)`
= 55.