Question 44
Measures of DispersionFind the variance of the number k, k + 1, k + 2
- A.2/3
- B.1
- C.k + 1
- D.(k + 1)2
Show the answer and explanation
Answer: A (2/3)
Explanation
The mean is k + 1 and the deviations are −1, 0, 1. Variance = (1 + 0 + 1)/3 = 2/3.