Suppose a shipment of 120 electronic components contains 3 defective components. to determine whether the shipment should be accepted, a quality-control engineer randomly selects 3 of the components and tests them. if 1 or more of the components is defective, the shipment is rejected. what is the probability that the shipment is rejected?

For this problem, the most accurate is to use combinations

Because the order in which it was selected in the components does not matter to us, we use combinations

Then the combinations are

n represents the amount of things you can choose and choose r from them

You need the probability that the 3 selected components at least one are defective.

That is the same as:

(1 - probability that no component of the selection is defective).

The probability that none of the 3 selected components are defective is:

Where is the number of ways to select 3 non-defective components from 117 non-defective components and is the number of ways to select 3 components from 120.

So:

Finally, the probability that at least one of the selected components is defective is:

  P = 7.4%

yes yes yes yes yes yes yes yes yes