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9. (i) Show that (x-x)2 = Lx2- ni2, where x. The times, to the nearest minute, taken by 60 studen ts to do their statistics h
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Σ(x- 2. HS - 2 (- end are こametans 2a- 2 2x 2 n.ma 2ma+ na proued R. H. スー295 10 2-a ムol valuu 1d- ime (mins 20 5 14 25 -1 15Standard deralan for cCeatu 7 60 29 19580.0S6.1 /8/x10 mimus bTimm abs bandany 9.41- 7 14.5 24.5 5-14 12 19 Z4.5-94.5 25-34 4Samplar Sampde 9.9 u Nuambe absevalian う236 Mean ミ3713/ Seユ SD Combrned en S 60x34 33+ 20x3 60イ20. 24.85 St.55 36- 347s $8.11680784ィ16t 2021 2 74.61 onimu

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