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  • Average marks of all 40 students in a class = 90 . average marks of to 5 students =97 . average marks of remaining 35 students =?

Average marks of all 40 students in a class = 90 . average marks of to 5 students =97 . average marks of remaining 35 students =?

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eginarrayl extAverage marks of 40 student=90\ extAverage marks of 5 student=97\ extAverage marks of remaining 35 student=?\ extSince Average marks of n student=fracleft( extsum of marks of n students ight)n\ extAverage marks of 40 student=fracleft( extsum of marks of 40 students ight)40\ Rightarrow90=fracleft[left( extsum of marks of 5 students ight)+left( extsum of marks of remaining 35 students ight) ight]40\ Rightarrow90 imes40=left(5 imes97 ight)+left( extsum of marks of remaining 35 students ight)\ Rightarrowleft( extsum of marks of remaining 35 students ight)=3600-485=3115\ extAverage marks of remaining 35 student=fracleft( extsum of marks of remaining 35 students ight)35\ =frac311535=89endarray

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Deependra Verma

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