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If the probability that the Islanders will beat the Rangers in a game is 
61%, what is the probability that the Islanders will win exactly five out of seven games in a series against the Rangers? Round your answer to the nearest thousandth.
Answer:

If the probability that the Islanders will beat the Rangers in a game is 61% 61 \% , what is the probability that the Islanders will win exactly five out of seven games in a series against the Rangers? Round your answer to the nearest thousandth.\newlineAnswer:

Full solution

Q. If the probability that the Islanders will beat the Rangers in a game is 61% 61 \% , what is the probability that the Islanders will win exactly five out of seven games in a series against the Rangers? Round your answer to the nearest thousandth.\newlineAnswer:
  1. Identify formula and values: Identify the binomial probability formula and the values of nn, kk, and pp. The binomial probability formula is P(X=k)=C(n,k)(p)k(1p)(nk)P(X = k) = C(n, k) \cdot (p)^k \cdot (1-p)^{(n-k)}. Here, nn is the number of trials, kk is the number of successes, and pp is the probability of success on a single trial. For this problem: n=7n = 7 (since there are seven games), k=5k = 5 (since we want to find the probability of exactly five wins), p=0.61p = 0.61 (since the probability of the Islanders winning a single game is 6161%).
  2. Calculate binomial coefficient: Calculate the binomial coefficient C(n,k)C(n, k). The binomial coefficient C(n,k)C(n, k) is calculated using the formula n!k!(nk)!\frac{n!}{k!(n - k)!}. Substitute n=7n = 7 and k=5k = 5 into the formula: C(7,5)=7!5!(75)!C(7, 5) = \frac{7!}{5!(7 - 5)!} = 7×62×1\frac{7 \times 6}{2 \times 1} = 422\frac{42}{2} = 2121.
  3. Calculate probability of five wins: Calculate the probability of exactly five wins P(X=5)P(X = 5). Using the binomial probability formula: P(X=5)=C(7,5)(0.61)5(10.61)(75)P(X = 5) = C(7, 5) \cdot (0.61)^5 \cdot (1 - 0.61)^{(7 - 5)} Substitute the values we have calculated: P(X=5)=21(0.61)5(0.39)2P(X = 5) = 21 \cdot (0.61)^5 \cdot (0.39)^2.
  4. Solve probabilities: Solve (0.61)5(0.61)^5 and (0.39)2(0.39)^2.\newlineCalculate (0.61)5(0.61)^5:\newline(0.61)5=0.61×0.61×0.61×0.61×0.61(0.61)^5 = 0.61 \times 0.61 \times 0.61 \times 0.61 \times 0.61\newline0.088567\approx 0.088567.\newlineCalculate (0.39)2(0.39)^2:\newline(0.39)2=0.39×0.39(0.39)^2 = 0.39 \times 0.39\newline0.1521\approx 0.1521.
  5. Multiply values for probability: Multiply all the values together to find the probability P(X=5)P(X = 5).P(X=5)=21×0.088567×0.15210.282711×0.15210.043004.P(X = 5) = 21 \times 0.088567 \times 0.1521 \approx 0.282711 \times 0.1521 \approx 0.043004.
  6. Round to nearest thousandth: Round the answer to the nearest thousandth.\newlineThe probability P(X=5)P(X = 5) rounded to the nearest thousandth is:\newline0.0430.043.

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