For the frequency distribution of marks ...

For the frequency distribution of marks scored by student, `A=57,sumf_(i)=80andsumf_(i)d_(i)=240`. Find mean marks.

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The correct Answer is:

The mean marks scored by a student is 60.

`bar(d)=(sumf_(i)d_(i))/(sumf_(i))" ".......` (Formula)
`=(240)/(80)=3" "......("substituting the values")" ":.bar(d)=3`
Mean `bar(X)=A+bar(d)" ".......` (Formula)
`=57+3" "......` (Substituting the values)
=60

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