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Calculate the mean marks from the follo...

Calculate the mean marks from the following data:
`{:("Marks",20-25,25-30,30-35,35-40,40-45,45-50,50-55),("No. of Students"," "10," "12," "8," "20," "11," "4," "5):}`

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`barX = A+(sumfd)/(sumf)`
`=37.5 + (-140)/70`
`= 37.5 - 2 = 35.5`
Mean Marks = 35.5.
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