The arithmetic mean of first 11 natural numbers is

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The arithmetic mean of first 11 natural numbers is

  1. A. 5
  2. B. 5.5
  3. C. 6.0
  4. D. 6.5

Answer: Option C

Here is complete explanation of The arithmetic mean of first 11 natural numbers is .

Solution(By ExamCraze Team)

Required mean
$$eqalign{ & = left( {frac{{1 + 2 + ..... + 11}}{{11}}} right) cr & = left( {frac{1}{{11}} times frac{{11 times 12}}{2}} right) cr & = 6 cr} $$
$$left[ {because 1 + 2 + ..... + n = frac{{nleft( {n + 1} right)}}{2}} right]$$

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