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

The standard deviation of the distances (in km) traveled by a group of 30 cars is 8.6 km. What is the variance of their distances?

1
33.65 km²
2
77.88 km²
3
43.98 km²
4
73.96 km²
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