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The frequency distribution of the marks obtained by 76 students in a math. Find the average of marks obtained .
`{:("Numbers obtained",1-10,11-20,21-30,31-40,41-50,"Total"),("Frequncies",4,14,32,18,8,76):}`

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`therefore u=(12)/(76)=0.158`
`therefore barx=25.5+10xx0.158=25.5 +1.58=27.08` (approx.)
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