JEE Main 2018 Mathematics question
The mean of a set of 30 observations is 75. If each other observation is multiplied by a non-zero number and then each of them is decreased by 25, their mean remains the same. Then is equal to
Answer: (B)
The mean of a set of 30 observations is 75. If each other observation is multiplied by a non-zero number and then each of them is decreased by 25, their mean remains the same. Then is equal to