If variance of a data set is 25 what is the standard deviation?
A
5
B
10
C
15
D
25
Correct Answer: Option A — 5
Explanation:
Standard deviation = √variance = √25 = 5. Variance is the average of squared deviations from the mean. Standard deviation being the square r...
Standard deviation = √variance = √25 = 5. Variance is the average of squared deviations from the mean. Standard deviation being the square root is expressed in the same units as the original data making it more interpretable. Both quantify data spread and appear in statistics-based competitive exam questions.