total marks: 128
1(d): 800(.80) + 2700(.05) = 775
2(c): z = 0.2, -0.6 => 0.5793 - 0.2743 = 30.50%
2(d): on SDSM: z = 1.96, -5.88 => 97.5%
5(a): joggers med=(32+39)/2 = 35.5
8(e) s_(Y|X) = 7.688
8(i) SEm = 0.2976, t = 3.66, 0.02 < p < 0.04
9(b): chisq=2.5