A factory produces two types of shirts. The factory conducted a survey to adjust the production quantity according to the market requirements. Samples of 100 sold shirts are chosen from each of the 5 shopping centers of the factory.
If the total production of this factory is 3 000 shirts, how many of them should be of type A?
Step 1: Use the survey to find the probability that a costumer
buys a type A shirt.
Divide the number of type A shirts sold in the survey by the total
number of shirts sold in the survey.
Step 2: Find the expected number of type A shirts the factory should produce out of shirts.
Multiply the total number of shirts produced by the probability
that a customer buys a type A shirt.