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Question

The following table given the weekly wages (in Rs.) of workers in a factory:
Weekly wages (in Rs.)50555560606565707075758080858590
No. of workers520101096128
Calculate:
The mean.

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Solution

Weeklywages Classmark
xi
No.ofworker
fi
fixi
5055 52.5 5 262.5
5560 57.5 20 1150
6065 62.5 10 625
6570 67.5 10 675
7075 72.5 9 652.5
7580 77.5 6 465
8085 82.5 12 990
8590 87.5 8 700
fi=80 fixi=5520
Required mean =fixifi=552080=69

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