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The mean of the first ten even natural number is-
- A. 0
- B. 10
- C. 11
- D. 12
Answer: Option C
Here is complete explanation of The mean of the first ten even natural number is .
Solution(By ExamCraze Team)
Required mean
$$eqalign{
& = left( {frac{{2 + 4 + 6 + ..... + 20}}{{10}}} right) cr
& = frac{{2left( {1 + 2 + ..... + 10} right)}}{{10}} cr} $$
$$ = left( {frac{1}{5} times frac{{10 times 11}}{2}} right)$$ $$left[ {because 1 + 2 + 3 + ... + n = frac{{nleft( {n + 1} right)}}{2}} right]$$
$$ = 11$$
