[理工] [機率]-機率
A store sells four brands of VCRs.The least expensive brand B1 accounts
for 40% of the sales. The other brands(in order of their price) have the
following percentages of sales:B2,30%;B3,20%;and B4,10%.The respective
probabilities of needing repair during warranty are 0.10 for B1,0.05 for
B2, 0.03 for B3, and 0.02 for B4. A randomly selected purchaser has a VCR
that needed repair under warranty. What are the four conditional
probabilities of being brand Bi, i=1,2,3,4 ?
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