Two stores sell a certain product. Store A has 45% of the sales, 3% of which are of defective items, and store B has 55% of the sales, 4% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives one of this product as a gift. What is the probability it is defective

Step-by-step explanation:

Given

Stot A:

Defective = 3%

Store B

Defective = 4%

Required

Determine the probability a product received is defective.

First, we calculate the probability that the defective product is from store A

Convert to decimals

Next, we calculate the probability that the defective product is from store B

The product may come from either stores.

So, the probability of having a defective product is:

add an image

step-by-step explanation:

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!