Multiple choice

There are 137 consecutive odd integers. The average of the first 129 is n. What is the average of all 137?

  1. n + 4

  2. n + 8

  3. n + 6

  4. n + 10

  5. Cannot be determined

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average of consecutive integers is always middle term. So, the average of first 129 terms is (129 + 1)/2= 65th term, which is n. Average of 137 terms is (137 + 1)/2 = 69th term. So, 69th term is 65th term + 2*4 = n + 8.