no 7)
peluang A gak lulus = 1 - 0,85 = 0,15
peluang A dan B gak lulus =
0,15 x 0,25 = 0,0375
no 8)
mean =
(39 x 2) + (40 x 4) + (41 x 8) + (42 x 5) + (43 x 1)/(2+4+8+5+1) =
(78 + 160 + 328 + 210 + 43)/(20) =
819/20 =
40,95
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no 7)
peluang A gak lulus = 1 - 0,85 = 0,15
peluang A dan B gak lulus =
0,15 x 0,25 = 0,0375
no 8)
mean =
(39 x 2) + (40 x 4) + (41 x 8) + (42 x 5) + (43 x 1)/(2+4+8+5+1) =
(78 + 160 + 328 + 210 + 43)/(20) =
819/20 =
40,95