Seventy percent of Mentor Products'spare parts inventory comes from Adams Supply, the remaining30% from Boulder Manufacturing. Over the years, 4% of theAdams-suppliedcomponents have proven defective, as compared to 7% of the Boulderparts. After purchase, the parts are normally mixed together in a large storage bin until they are needed. If you were to select a part at random from the bin and test it:

a) Draw all probabilities on the branches reflect information we already know or can easily establish.

b) How likely is it that Boulders suppliers will be defective?

c) How likely is that Adams suppliers will be ok?

d) How likely is it that suppliers will be ok?

e) How likely is that suppliers will be defective?