Two dice are thrown simultaneously. Find the probability that the sum ...
To find the probability that the sum of points on two thrown dice is 7 or more, we need to follow these steps:
Step 1: Total Outcomes
- When two dice are thrown, each die has 6 faces.
- Therefore, the total number of outcomes is:
6 (for the first die) × 6 (for the second die) = 36 outcomes.
Step 2: Favorable Outcomes
- We need to determine the combinations that give a sum of 7 or more. The possible sums are:
- Sum = 7: (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) → 6 outcomes
- Sum = 8: (2,6), (3,5), (4,4), (5,3), (6,2) → 5 outcomes
- Sum = 9: (3,6), (4,5), (5,4), (6,3) → 4 outcomes
- Sum = 10: (4,6), (5,5), (6,4) → 3 outcomes
- Sum = 11: (5,6), (6,5) → 2 outcomes
- Sum = 12: (6,6) → 1 outcome
- Adding these outcomes gives:
6 + 5 + 4 + 3 + 2 + 1 = 21 favorable outcomes.
Step 3: Calculate Probability
- The probability (P) of getting a sum of 7 or more is given by the formula:
P = (Number of Favorable Outcomes) / (Total Outcomes)
P = 21 / 36
- Simplifying this fraction, we get:
P = 7 / 12
Conclusion
- The probability that the sum of points on two dice would be 7 or more is:
7/12.