Multiple choice general knowledge math & puzzles

average of 5 consecutive number is "n". If the next two numbers are also included,then average will be:

  1. increase by 1

  2. increase by 2

  3. increase by 1.4

  4. remain same

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

For 5 consecutive numbers with average n, the numbers are n-2, n-1, n, n+1, n+2, summing to 5n. Adding the next two numbers (n+3, n+4) gives sum 7n+7 over 7 numbers, so new average is n+1.