The mean of the following frequency distribution is 62.8 and the sum of all frequencies is 50. Compute the missing frequencies f_1 and f_2.

1 Answer

answered Mar 13, 2018 by mdsamim (213,225 points)
selected Mar 15, 2018 by faiz

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Classes	0-20	20-40	40-60	60-80	80-100	100-120	Total
Frequency	5	f₁	10	f₂	7	8	50

Classes	f_i	x_i	f_ix_i
0-20	5	10	50
20-40	f_i	30	30f₁
40-60	10	50	500
60-80	f₂	70	70f₂
80-100	7	90	630
100-120	8	110	880
	50		2060+30f₁+70f₂

The mean of the following frequency distribution is 62.8 and the sum of all frequencies is 50. Compute the missing frequencies f_1 and f_2.

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