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cheyennecarrillo14
21.05.2021 •
Mathematics
LAST QUESTION ON MATH TEST. HELP
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Ответ:
its C
Step-by-step explanation:
Ответ:
a) 0.48
b) 0.0329
c) 0.625
Step-by-step explanation:
Let the number of the valves be = 15
The probability of the valves being faulty, P(B) =![\frac{3}{15} = \frac{1}{5}](/tpl/images/0537/6145/bac5f.png)
the probability that a valve is in good condition, P(G) =![\frac{12}{15} = \frac{4}{5}](/tpl/images/0537/6145/d5dbf.png)
a) probability valves are defective-free P(GGGG)![\frac{12}{15}*\frac{11}{14}* \frac{11}{13}*\frac{11}{12} \\= 0.48](/tpl/images/0537/6145/c7b2b.png)
b) probability the three will be defective = P (BBB)
=![\frac{3}{15}*\frac{2}{14}*\frac{1}{13}\\ = 0.0329](/tpl/images/0537/6145/6caea.png)
c) P (at least one defective) = 0.625