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mmoreno8041
11.03.2020 •
Mathematics
Printed circuit cards are placed in a functional test after being populated with semiconductor chips. A lot contains 110 cards, and 20 are selected without replacement for functional testing.
(a) If 20 cards are defective, what is the probability that at least 1 defective card is in the sample?
(b) If 5 cards are defective, what is the probability that at least 1 defective card appears in the sample?
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Ответ:
The answers to the questions are;
(a) P(At least 1 defective)
= 0.9883.
(b) P(At least 1 defective)
= 0.6409.
Step-by-step explanation:
There are 110 cards and 20 defectives.
a) The probability of at least one defective is given by
P(At least 1 defective) = 1 - P(0 defective)
P(0 defective) = 20C0 × (90C0)/(110C20) = 0.0116
1 - 0.0116 = 0.9883
b) For a set of 110 boards that has 5 defective and 105 non-defective
P(At least 1 defective) = 1 - P(0 defective)
P(0 defective) = (20C0)(90C5)/(110C5) = 0.35909
1-0.35909
= 0.6409
Ответ:
See explanation
Step-by-step explanation:
There are so many ways we can rewrite
.
We can apply the power rule to obtain:
We could also simplify this further because![\log10=1](/tpl/images/0174/8501/67a39.png)
This implies that:
Or
All these are equivalent expressions.