Question

A camera company routinely ships cameras that have 4 defective cameras for every 800 cameras shipped. Bradley works at a photo shop that sells the cameras to consumers. If Bradley sells 200 cameras, how many can Bradley expect to be working?

Answer 1

The probability of a camera being defective is given as 4 defective cameras for every 800 cameras shipped.

So, the probability of a camera being working would be 1 minus the probability of a camera being defective.

The probability of a camera being defective is:

4/800 = 1/200

So, the probability of a camera being working is:

1 - 1/200 = 199/200

Therefore, out of 200 cameras sold by Bradley, we can expect:

Number of working cameras = 200 x (199/200) = 199 cameras

So, Bradley can expect 199 cameras to be working.

Explanation: