Question

If mean if 29 observations is 33 and on adding one more observation the new mean becomes 34 .what is the value of the 30th observation

Answer 1

Mean = sum of the numbers / total numbers

33 = sum of the numbers / 29

. 33 × 29 = sum of the numbers

957 = sum of the numbers

Let new observations that is added be x

Then, new mean is 34 and observation becomes 30

Mean = sum of the numbers / total numbers

34 = 957 + X /30

34 × 30 = 957 + x

1020 = 957 + x

1020 - 957 = x

63 = x

Answer - 63