Question

1. The mean of 10 number is 55. If one
number is excluded, their mean becomes
50. The excluded number is
​

Answer 1

Answer:

mean of 10 number is 55

so sum of those 10 number will be = 10x55

                                                         = 550

now one number is excluded and mean of remaining 9 numbers is 50

so sum of remaining 9 number is = 9x50 = 450

hence excluded number is = 550-450=100 Ans

Answer 2

Mean = Sum of terms ÷ Total terms

So, 55=x÷10

x=550

Now if one term is exlucise then total term are 9

So now mean =50

Mean = Sum of term ÷ Total terms

50=y÷9

y=450

So exclusive term will be

x-y

550-450

=>100

So Answer Is 100

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