OpenStax, Contemporary Mathematics §7.11 Expected Value · Example 1 · Probability · Expectation
Expected Value · Example 1
Find the expected values of the following experiments.
(a) Roll a standard 6-sided die and note the number showing.
(b) Roll two 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).
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Contemporary Mathematics · §7.11 Expected Value · Example 1
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