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The following distribution shows the dai...

The following distribution shows the daily pocket allowance of children of a locality . The mean pocket allowance is ₹ 18. Find the missing frequency f.
`{:("Daily pocket allowance (in ₹) ",11-13,13-15,15-17,17-19,19-21,21-23,23-25),("Number of children "," "7," "6," "9," "13," "f," "5," "4):}`

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The correct Answer is:
20
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