railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Standard Deviation

The standard deviation of the ages (in years) of a group of 12 adults is 5.7 years. What is the variance of their ages?

1

38 years

2

22.49 years

3

32.49 years

4

30.44 years

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