Math Problem Statement
くじが10本ある 当たりが3本 ハズレが7本 当たりを引くと1000円もらえる はずれるともらえない 引いたくじは戻さない 4人目は何円ならチャレンジするか
Solution
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Math Problem Analysis
Mathematical Concepts
Probability
Expected Value
Formulas
Expected value formula: E(X) = Σ [P(x) * x]
Theorems
Law of Total Probability
Suitable Grade Level
Grades 9-12
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