Find the mean weight of the parcels.

Question

Weights of parcels in a transport office are given below.

Weight (kg)	50	65	75	90	110	120
No of parcels	25	34	38	40	47	16

Find the mean weight of the parcels.

Answer 1

Weight in kg x	No. of parcels fi	x1fi
50	25	1250
65	34	2210
75	38	2850
90	40	3600
110	47	5170
120	16	1920

 Σf_i = 200 

Σf_i x_i = 17000

\(\overline x = \frac {\sum f_ix_i} {\sum f_i} = \frac {17000}{200} = \frac {170}{2}\)

\(\overline x \) = 85

Mean = 85