# Find the mean weight of the parcels.

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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.

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 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

Σfi = 200

Σfi xi = 17000

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

$\overline x$ = 85

Mean = 85