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(7). A computer store finds when the customer purchasing one model of computer, 30% upgrade the ram from 16GB to 32GB, the remaining 70% customer
(7). A computer store finds when the customer purchasing one model of computer, 30% upgrade the ram from 16GB to 32GB, the remaining 70% customer do not upgrade. Given the customer upgrade the ram, the probability he will purchase extra warranty is 40%; while given the customer do not upgrade the ram, the probability he will purchase extra warranty is 10%. Define events: Y = {upgrade ram}, N= {not upgrade ram}, W ={purchase extra warranty}. Find P(W'), the probability that one randomly selected customer does NOT purchases extra warranty.
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