Hi,

60% are purchased from company A, and 40 % are from Company B. 

2% of those supplied by company A and 1% of those supplied by Company B are known to be defective.

(a) Draw a tree diagram to represent the possible outcomes when a single component is selected at random.

unable to Draw tree diagrams on this site

 (b) A component is selected at random. 

(i) P(Co A and defective) =  = .012

    P(Co B and defective) =  

(ii) P(defective) =  +  = .012 + .004 = .016

    P(A|B) = P(A and B)/P(B)  

P(Co A| Def) =   

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