Students in Mr Brawn's exercise class have to do press-ups and sit-ups. The number of press-ups x and the number of sit-ups y done by a random sample of 8 students are summarised below. Σε = 272, Ey=320, The addition of the mean and standard deviation of the number of press-ups done by these students, is Σχ" = 10 164. 2y =13 464. (A) 44 (B) 44.07 (C) 44.70 (D)None of these Σxy = 11 222,

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