Two stores sell a certain product. Store A has 39% of the sales, 5% of which are of defective items, and store Bhas 61% of the sales, 3% of which are of defective items. The difference in defective rates is due to differentlevels of pre-sale checking of the product. A person receives one of this product as a gift. What is theprobability it is defective? Round to the nearest thousandth when necessary.
A) 0.038
B) 0.04
C) 0.019
D) 0.44

Question

Quizplus · Accepted Answer

The probability of receiving a defective item is calculated by summing the products of each store's share of total sales and its defective rate, then dividing by 100 to convert percentages to probabilities: (39% * 5% + 61% * 3%) / 100 = 0.038.

Two Stores Sell a Certain Product