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The following distribution shows the poc...

The following distribution shows the pocket allowance of children of a locality The mean pocket allowance is Rs18 . Find the missing frequency f .
`{:("Daily pocket allowance (in Rupees)","Number of children"),(11-13,7),(13-15,6),(15-17,9),(17-19,13),(19-21,f),(21-23,5),(23-25,4):}`

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