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Question

Frequency distribution of daily commission received by 100 salesmen is given.
Daily Commission(in Rs.)No. of Salesmen
10012020
12014045
14016022
16018009
18020004
Find mean daily commission received by salesman, by assumed mean method.

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Solution

Let us take the assumed mean to be A=150.

Interval xi fidi=xiA fidi
100120 11020 40 800
1201401304520900
1401601502200
1601801700920180
1802001900440160
Total fi = 100 fidi =1360
Now the actual mean by the assumed mean method is given by,

¯¯¯x= A+fidifi
where ¯¯¯x is the actual mean and A is the assumed mean.

Substituting the values into the formula, we get:

¯¯¯x=150+(1360)100

That gives, ¯¯¯x=136.4. The mean daily commission is Rs136.4

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