SOLUTION: A lot of portable radios contain 15 good radios and 3 defective ones. If two are selected and tested, find the probability that at least one will be defective.

Question 581792: A lot of portable radios contain 15 good radios and 3 defective ones. If two are selected and tested, find the probability that at least one will be defective.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A lot of portable radios contain 15 good radios and 3 defective ones. If two are selected and tested, find the probability that at least one will be defective.
--------
Binomial with p(defective) = 3/18 and p(good) = 15/18
----
P(>= 1 defective) = 1 - P(none defective)
---
= 1 - (15/18)^2
---
= 0.3056
=============
Cheers,
Stan H.
RELATED QUESTIONS
A lot of portable radios contains 15 good radios and 3 defective ones. If two are... (answered by Fombitz)

Suppose a company that makes radios is interested in quality control of their factory. As (answered by stanbon)

Suppose a company that makes radios is interested in quality control of their factory. As (answered by edjones)

6% of all radios manufactured are defective, find the probability of selecting two radios (answered by ikleyn)

In A batch of 8000 clock radios 9% are defective. A sample of 6 clock radios is randomly (answered by stanbon)

In a batch of 8,000 clock radios 4% are defective. A sample of 6 clock radios is randomly (answered by stanbon,edjones)

In a batch of 8000 clock radios 9% are defective. A sample of 10 clock radios is... (answered by stanbon)

In a batch of 8000 clock radios 9% are defective. A sample of 15 clock radios is randomly (answered by stanbon)

A box contains 24 bulbs, 3 of which are defective. If two bulbs are selected and tested,... (answered by Boreal,greenestamps)