Question 6
Measures of DispersionFind the variance of 2x, 2x − 1 and 2x + 1
- A.2/3
- B.2
- C.√(2/3)
- D.1
Show the answer and explanation
Answer: A (2/3)
Explanation
The mean is 2x and the deviations are 0, −1, 1. Variance = (0 + 1 + 1)/3 = 2/3.
Find the variance of 2x, 2x − 1 and 2x + 1
Answer: A (2/3)
The mean is 2x and the deviations are 0, −1, 1. Variance = (0 + 1 + 1)/3 = 2/3.