Quantitative Aptitude Elementary Statistics

అంకెలు 2, 9, 9, 3, 6, 9, 4 యొక్క సగటు నుండి ప్రామాణిక విచలనం ఎంత:

A. 42/7

B. 18/7

C. 2.5

D. 50/7

1
B
2
D
3
C
4
A

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