26 P(6, 7, 8) = × M1 2 M1 for multiplication showing without replacement for H = = two draws 0.04977… 0.050 A1 A1 cao 2 P(late) = 0.08 B1 2 B1 for correct multiplication for different events oe H 27 a P(not late) = 0.92 P(early) = 0.02 P(not early) = 0.98 P(rain) = 0.3 P(not rain) = 0.7 P(on time) = 1 P(late) P(early) = 1 - – – 0.08 0.02 = 0.9 – P(on time, not raining) = 0.9 × 0.7 = 0.63 0.63 b P(rain, rain, rain)= 0.33 = 0.027 0.027 B1 B1 for correct multiplication for three same events oe c P(not late five days in a row) = 0.925 = 0.659 B1 B1 for correct multiplication for three same complement 0.6591 events oe 3
26 P(6, 7, 8) = × = = 0.04977… 0.050 M1 A1 2 M1 for multiplication showing without replacement for two draws A1 cao H 2 27 a b c P(late) = 0.08 P(not late) = 0.92 P(early) = 0.02 P(not early) = 0.98 P(rain) = 0.3 P(not rain) = 0.7 P(on time) = 1 – P(late) – P(early) = 1 - 0.08 – 0.02 = 0.9 P(on time, not raining) = 0.9 × 0.7 = 0.63 P(rain, rain, rain)= 0.33 = 0.027 P(not late five days in a row) = 0.925 = 0.6591 0.63 0.027 0.659 B1 B1 B1 2 B1 for correct multiplication for different events oe B1 for correct multiplication for three same events oe B1 for correct multiplication for three same complement events oe H 3
Foundation_Skills_Probability%20MarkScheme_AQA.docx