Digital ACT Math Practice Question #2098
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$E = (18)(1/6) - (3)(5/6) = 3 - 2.50 = +0.50$.
Expected value $E(X) = \sum x_i P(x_i) = 18 \times \frac{1}{6} + (-3) \times \frac{5}{6} = 3 - 2.50 = 0.50$. The player expects to win $0.50 per roll....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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