Question

What is the standard deviation of a data set if the data set has a variance of 0.81?

• A. 0.2
• B. 0.41
• C. 0.9
• D. 9

Answer 1

Answer:

C. 0.9

Given:

Variance = 0.81

Formula:

Variance = Standard deviation²

Calculation:

Standard deviation = (variance)^1/2

⇒ Standard deviation = (0.81)^1/2

∴ Standard deviation = 0.9