railway RRB Technician Grade 3 Mock Test 2024 Quantitative Aptitude Elementary Statistics

खालील आवृत्ति वितरणासाठी सरासरी विचलनाची गणना करा:

वर्ग मध्यांतर 0-4 4-8 8-12 12-16 16-20
वारंवारता 4 6 8 5 2

1
9.5
2
2.69
3
3.84
4
4.56
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