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In the following frequency distribution,...

In the following frequency distribution, if the arithmetic mean is 45.6, find out missing frequency.
`{:("Wages(Rs.)",10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Workers"," "5," "6," "7," "X," "4," "3," "9):}`

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The correct Answer is:
135.77
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