Math Problem Statement
Um cubo de madeira com todas as faces pintadas é cortado em 216 cubinhos de tamanhos iguais. Seja X o número de faces pintadas de um cubinho escolhido aleatoriamente. Calcule σ(X)
Solution
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Math Problem Analysis
Mathematical Concepts
Probability
Expected Value
Variance
Formulas
Variance formula: \( \sigma^2(X) = \mathbb{E}(X^2) - (\mathbb{E}(X))^2 \)
Theorems
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Suitable Grade Level
Grades 11-12
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