A. Among a shipment of 5,000 tires, 1,000 are slightly blemished. If one purchases 10 of these tires, what is the probability that 3 or less (P (x <= 3) are blemished?

Step-by-step explanation:

3 or less than 3 tires among the 10 tires should be blemished.

There are some possibilities.

1000 tires are blemished, (5000 - 1000) = 4000 tires are not blemished.

From the 5000 tires, 10 tires can be chosen in ways.

Possibility 1: 3 tires are blemished.

Total 10 tires can be chosen with 3 blemished tires in ways.

Possibility 2:  2 tires are blemished.

Total 10 tires can be chosen with 2 blemished tires in  ways.

Possibility 3: 1 tires are blemished.

Total 10 tires can be chosen with 1 blemished tires in ways.

Possibility 4:  No tires are blemished.

Total 10 tires can be chosen with no blemished tires in ways.

Hence, the required probability is .