1 + 2 + 3 + 4 + 5 + 6 6
Suppose an ordinary, fair six-sided die is rolled (i.e., for i = 1, 2, 3, 4, 5, 6, there is one side with i spots), and X = “the number of spots facing upward” is observed. What is the average value for X ?. 1 + 2 + 3 + 4 + 5 + 6 6.
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