Pregunta
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A die is rolled twice. What is the probability of showing a 5 on the first roll and an even number on the second roll? Your answer is:

Ask by Ball Stephens. in the United States
Mar 08,2025

Solución de inteligencia artificial de Upstudy

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The probability of rolling a 5 on the first roll and an even number on the second roll is \(\frac{1}{12}\).

Solución

Let the sample space be all ordered pairs \((X, Y)\) where \(X\) is the outcome of the first roll and \(Y\) is the outcome of the second roll. There are \(6 \times 6 = 36\) possible outcomes. **Step 1: Find the probability of rolling a 5 on the first roll.** The probability is: \[ P(X=5) = \frac{1}{6} \] **Step 2: Find the probability of rolling an even number on the second roll.** The even numbers on a die are \(2, 4,\) and \(6\), so the probability is: \[ P(Y \text{ is even}) = \frac{3}{6} = \frac{1}{2} \] **Step 3: Calculate the combined probability.** Since the two rolls are independent events, we multiply the probabilities: \[ P(\text{5 on first roll and even on second roll}) = \frac{1}{6} \times \frac{1}{2} = \frac{1}{12} \] Final Answer: \[ \boxed{\frac{1}{12}} \]

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The Deep Dive

When rolling a die, the probability of rolling a 5 on the first roll is 1 out of 6, since there are six faces on the die. Now, for the second roll, the even numbers available are 2, 4, and 6, making a total of 3 even numbers out of the 6 possible outcomes. Therefore, the probability of rolling an even number is also 3 out of 6, or 1 out of 2. To find the combined probability, you multiply the probabilities of both events: (1/6) * (1/2) = 1/12. So, the probability of showing a 5 on the first roll and an even number on the second roll is 1/12.

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