2022 · Q66
If M is the mean of the first 100 even natural numbers, then what is the mean of the first 100 odd natural numbers?
Elementary MathematicsStatistics
- AM - 1
- BM
- CM + 1
- DM + 2
Explanation
Mean of 2,4,…,200 is 101 = M; mean of 1,3,…,199 is 100 = M−1. Pairing each even number 2k with the odd number 2k−1 shows every odd term is exactly 1 less. The keyed option is A.