How was the "Expected Results" table calculated in the picture below? I'm trying graph the probability of different results based on buying N number of scratch tickets. Imagine a game with 4 tiers or prizes.
Prize Value Number of tickets 100 4 10 40 1 100 0 846
What would my expected +/- results be 66% of the time if I bought 10 tickets? How does one figure that out?
picture-2.jpg
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