Question #216637

A store had a scratch-and-win promotion in which 1000 cards indicated 10% off, 50 cards indicated 15% off, 10 cards indicated 20% off and 1 card indicated 40% off. What is the expected value for a given scratch-and-win card? *


1
Expert's answer
2021-07-13T13:30:26-0400

E(X)=11061(1000∗10+50∗15+10∗20+1∗40)=109901061≈10.36%.E(X)=\frac{1}{1061}(1000*10+50*15+10*20+1*40)=\frac{10990}{1061}\approx10.36\%.


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