jackieespi1461
04.02.2020 •
Mathematics
Ashipment of 12 microwave ovens contains three defective units. a vending company has ordered four units, and because each has identical packaging, the selection will be random. what is the probability that (a) all four units are good, (b) exactly two units are good, and (c) at least two units are good?
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Ответ:
a) 54/55
b) 100/110
c) 99/110
Step-by-step explanation:
a)Probability of ordering 4= 9/12×3/11×2/10×1/9 = 54/11880
Probability of 4 good units= 4 × 54/11880
= 216/11880
1/55
1-(1/55) = 54/55
b)Probability of 2 good units= 2 × 54/(11880)
= 108/11880
= 1/110
1- (1/110)= 100/110
c) Probability of exactly 2 units not good= 1 -(100/110) =99/110
Ответ:
6
Step-by-step explanation:
= 6