Illustration 10.18. In a co-educational college boys and girls formed separate groups on the foundation day when every one had to put in physical labour. Compute standard deviation_for boys and girls separately and for the combined group. Did the separation by sex make each work-group more homogeneous. Minutes of labour given by each individual No. of girls No. of boys 60 20 120 55 60 100 100 200 50 45 450 355 40 450 350 35 300 SCO 30 250 350 25 100 20

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