3-34. Amanufacturer of automatic garage door openers buys circuit boards from three different suppliers: 40% of the total supply comes from Vendor A, 10% comes from Vendor B, and 50% comes from Vendor C. Since the quality control standards of the vendors vary somewhat, experience indicates that 2% of Vendor A’s shipments are defective, Vendor B ships 3%

defective, and 1% of Vendor C’s shipments have proven to be defective.

The manufacturer wants to determine the proportion of circuit boards in the latest shipments that are defective.