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#1
10-15-2011, 01:39 AM
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ASM 3L 10th ed Practice Exam 4 #3
Q: Prob of milk carton on the shelf is purchased on any day is 20%.
Milk cartons are discarded after 7 days. Determine the avg number of full days a purchased milk carton is on the shelf. I didn't fully follow the answer. [ (sum from 1 to 7 of .8^k) - 7(.8^.7) ] / (1-0.8^7) I went with summing (1)(.8)(.2) + 2(.8^2)(.2) + .... not sure why my answer didn't turn out.
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