Statistics
Variance
JEE Main 2021
Grade 11
Question:
The variance of the data 1, 2, 3, 4, 5 is:
(1) 2
(2) 2.5
(3) 10
(4) 4
Step-by-Step Solution
Key Concept: First find the mean of the data, then compute $\frac{1}{n} \sum (x_i - \bar{x})^2$ by squaring each deviation from the mean and averaging.
The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.
Correct Answer: (1)