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The arithmetic mean (average) of the first 10 whole numbers

Home » Aptitude » Average » Question
  1. The arithmetic mean (average) of the first 10 whole numbers is
    1. 5
    2. 4
    3. 5.5
    4. 4.5
Correct Option: D

The first 10 whole numbers are :
0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9
Sum of first 10 whole numbers = 0 + 1 + 2 + 3 +.....+ 9
Required average =
0 + 1 + 2 + 3 +.....+ 9
10

Required average =
9 × (9 + 1)
2 × 10

Required average = 4.5



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