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If a fair die is rolled 7 times, what is the probability, rounded to the nearest thousandth, of getting at most 1 six?
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If a fair die is rolled 77 times, what is the probability, rounded to the nearest thousandth, of getting at most 11 six?\newlineAnswer:

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Q. If a fair die is rolled 77 times, what is the probability, rounded to the nearest thousandth, of getting at most 11 six?\newlineAnswer:
  1. Understand the problem: Understand the problem.\newlineWe need to calculate the probability of rolling at most one six in seven rolls of a fair die. This means we can have either zero sixes or one six in our rolls.
  2. Calculate single roll probability: Calculate the probability of rolling a six on a single roll.\newlineThe probability of rolling a six on a single die is 16\frac{1}{6}, and the probability of not rolling a six is 56\frac{5}{6}.
  3. Calculate no sixes in seven rolls: Calculate the probability of rolling no sixes in seven rolls.\newlineThe probability of not rolling a six in seven rolls is (56)7(\frac{5}{6})^7.
  4. Calculate exactly one six: Calculate the probability of rolling exactly one six in seven rolls. The probability of rolling exactly one six can occur in any of the seven rolls. We can calculate this by multiplying the probability of rolling a six once 16\frac{1}{6} by the probability of not rolling a six in the other six rolls (56)6\left(\frac{5}{6}\right)^6, and then multiplying by the number of ways this can happen, which is 77 choose 11 7C17C1.
  5. Calculate 7C17C1: Calculate 7C17C1.\newline7C17C1 is the number of combinations of rolling one six in seven rolls, which is 77.
  6. Calculate total probability: Calculate the total probability of rolling exactly one six.\newlineThe total probability of rolling exactly one six is 7×(16)×(56)67 \times \left(\frac{1}{6}\right) \times \left(\frac{5}{6}\right)^6.
  7. Add probabilities: Add the probabilities of rolling no sixes and exactly one six.\newlineThe total probability of rolling at most one six is the sum of the probabilities of rolling no sixes and exactly one six: (56)7+7(16)(56)6(\frac{5}{6})^7 + 7 \cdot (\frac{1}{6}) \cdot (\frac{5}{6})^6.
  8. Perform calculations: Perform the calculations.\newline(56)7=0.27908(\frac{5}{6})^7 = 0.27908 (rounded to five decimal places)\newline7×(16)×(56)6=0.390137 \times (\frac{1}{6}) \times (\frac{5}{6})^6 = 0.39013 (rounded to five decimal places)\newlineAdding these two probabilities gives us 0.27908+0.39013=0.669210.27908 + 0.39013 = 0.66921.
  9. Round final probability: Round the final probability to the nearest thousandth.\newlineThe final probability rounded to the nearest thousandth is 0.6690.669.

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