The probability that an electronic device produced by a company does not function properly is equal to 0.1. If 10 devices are bought, then the probability, to the nearest thousandth, that 7 devices function properly is
A. 0.057
B. 0.478
C. 0.001
D. 0
Answer:
Let q be the probability a device does not function properly and p=1−q=0.9, the probability that a device functions properly.
Since there are only two possible results it is a binomial distribution.
C(10,7)×0.9
7
×0.1
3
where C(10,7) is the number of ways that 7 items are selected from 10 and is given by,
P=C(10,7)=
7!3!
10!
=0.057
Hence, option A is correct
Answer:
C
Step-by-step explanation:
We are given that the probability that an electronic device produced by a company does not function properly is equal to 0.1