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For 100 families, step size 5,000, sum fd' = -40 and sum fd'^2 = 340. SD?
ARs 3,240
BRs 5,000
CRs 9,000
DRs 18,000
Answer & Solution
Correct answer: C. Rs 9,000
SD = 5000 x sqrt(340/100 - (-40/100)^2) = 5000 x sqrt(3.24) = 5000 x 1.8 = 9,000.
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