if the mean mark of 10 boys is 40 and the sumof the marks of 9 students is 390+m ,find the value of m, where the mark of left one boy is 8
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Total Observations=10
Mean=40
Therefore sum of observations=10x40=400
Marks of boy that is left=8
therefore, 390+8+m=400
m=2
Mean=40
Therefore sum of observations=10x40=400
Marks of boy that is left=8
therefore, 390+8+m=400
m=2
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