Question

Please solve the (i) part

Answer 1

The mean of 100 observations is 50. If one of the observation which was 50 is replaced by 150 then what will be the resulting mean

Sorry IDK :(

Answer 2

Answer:

While solving questions where we have to prove LHS = RHS, we cannot operate both the sides simulataneously, since that is what we have to prove.

Example: To prove (a - b)2 =a2 - 2ab + b2

We first have to either take LHS and prove it equal to the RHS or take the RHS and prove it equal to the LHS.