Answer:
Expected_A = 1.36
Expected_B = 1.54
Company A, as it has the lowest expected number of defective boards
Step-by-step explanation:
What is the expected number of defective circuit boards for company A?
To obtain this value, we multiply the probabilities of each, per the number of defective circuit boards
Expected_A = 0*(0.21) + 1*(0.3) + 2*(0.41) + 3*(0.08)
Expected_A = 1.36
What is the expected number of defective circuit boards for company B?
Expected_B = 0*(0.18) + 1*(0.32) + 2*(0.28) + 3*(0.22)
Expected_B = 1.54
Which company should be chosen for purchasing circuit boards?
Company A, as it has the lowest expected number of defective boards