Lemma
EasyExpectation
OpenStax, Contemporary Mathematics §7.11 Expected Value · Example 2 · Probability · Expectation

Expected Value · Example 2

Interpret the expected values of the following experiments.

(a) Roll a standard 6-sided die and note the number showing.
(b) Roll 2 standard 6-sided dice and note the sum of the numbers showing.
(c) Draw a card from a well-shuffled standard deck of cards and note its Rummy value (15 for aces; 10 for tens, jacks, queens, and kings; 5 for everything else).

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OpenStax, Contemporary Mathematics · §7.11 Expected Value · Example 2

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