nine number is 77 the one added to the mean to increase 5 find the added to in the data .
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let the number added be x
sum of 9 numbers= 9*77=693
according to question
if one number is added so the total numbers will become 10
(9*77)+x= 10*78
693+x =780
so x= 87...
sum of 9 numbers= 9*77=693
according to question
if one number is added so the total numbers will become 10
(9*77)+x= 10*78
693+x =780
so x= 87...
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