If the arithmetic mean of the data given...

If the arithmetic mean of the data given below is 28 , find (a) the missing frequency , and (b) the median of the series :
`{:("Profit per Retail Shop (inRs.)",0-10,10-20,20-30,30-40,40-50,50-60),("Number of Retail Shops"," "12," "18," "27," "f," "17," "6):}`

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If the arithmetic mean of the data given below is 28 , find (a) the missing frequency , and (b) the median of the series : `{:("Profit per Retail Shop (inRs.)",0-10,10-20,20-30,30-40,40-50,50-60),("Number of Retail Shops"," "12," "18," "27," "f," "17," "6):}`

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If the arithmetic mean of the data given below is 28 , find (a) the missing frequency , and (b) the median of the series :
`{:("Profit per Retail Shop (inRs.)",0-10,10-20,20-30,30-40,40-50,50-60),("Number of Retail Shops"," "12," "18," "27," "f," "17," "6):}`