The variance of first n natural numbers is –
2021
The variance of first n natural numbers is –
- A.
(n+1) / 2
- B.
(n+1)2 / 12
- C.
(2n2-1) / 8
- D.
(n2-1) / 12
Attempted by 20 students.
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Correct answer: D
The variance of the first n natural numbers is calculated using the formula (n² - 1) / 12.
This result is derived from the general variance formula applied to the sequence 1, 2, ..., n.