SOLUTION: a retailer takes delivery of a consignment of 40 laptops. unknown to the retailer, there are 12 defective laptops on the consignment. the retailers quality control department will

Question 809184: a retailer takes delivery of a consignment of 40 laptops. unknown to the retailer, there are 12 defective laptops on the consignment. the retailers quality control department will take a random sample of 15 laptops. they will test each of these and if any are defective, the retailer will return the entire consignment to the supplier.
a) how many different sample sizes of 15 could the retailer take?
b) what is the probability that the retailer will return the consignment?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
a)40C15=40225345056
.
b)combinations of 15 out of 28 non defective laptops / 15 out of 40 laptops
28C15/40C15 = 37442160 / 40225345056 = 805 / 864838
.
Ed
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