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  1. The average of nine consecutive numbers is n. If the next two numbers are also included the new average will
    1. increase by 2
    2. remain the same
    3. increase by 1.5
    4. increase by 1
Correct Option: D

Given that , Fifth number = n
Tenth number = n + 5
Eleventh number = n + 6

New average =
9n + n + 5 + n + 6
11

New average =
11n + 11
 =
(n + 1) × 11
 = n + 1
1111


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