Question

2.
If the mean of 5, 7, 9, 12,5, 13, a, 10 is 8 then find the value of a.
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Answer 1

Answer:

step 1 let add the all digits like given in question

5+7+9+12+5+13+a+10

now all digits total numbers are 8 so

step 2: 5+7+9+12+5+13+a+10/ 8 =8

add the total numbers

61+a=8×8

61+a=64

a=64-61

a=3

answer

Answer 2

Mean = sum of all the elements given ÷ no of elements
5+7+9+12+5+13+10+a ÷ 8 =8
61+a=64
Then,
a=64-61=3
Therefore a=3