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:
Q. 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:
Identify formula and values: Identify the binomial probability formula and the values of n, k, and p. The binomial probability formula is P(X=k)=C(n,k)⋅(p)k⋅(1−p)(n−k). Here, n is the number of trials, k is the number of successes, and p is the probability of success on a single trial. For this problem: n=7 (since there are seven games), k=5 (since we want to find the probability of exactly five wins), p=0.61 (since the probability of the Islanders winning a single game is 61%).
Calculate binomial coefficient: Calculate the binomial coefficient C(n,k). The binomial coefficient C(n,k) is calculated using the formula k!(n−k)!n!. Substitute n=7 and k=5 into the formula: C(7,5)=5!(7−5)!7! = 2×17×6 = 242 = 21.
Calculate probability of five wins: Calculate the probability of exactly five wins P(X=5). Using the binomial probability formula: P(X=5)=C(7,5)⋅(0.61)5⋅(1−0.61)(7−5) Substitute the values we have calculated: P(X=5)=21⋅(0.61)5⋅(0.39)2.
Solve probabilities: Solve (0.61)5 and (0.39)2.Calculate (0.61)5:(0.61)5=0.61×0.61×0.61×0.61×0.61≈0.088567.Calculate (0.39)2:(0.39)2=0.39×0.39≈0.1521.
Multiply values for probability: Multiply all the values together to find the probability P(X=5).P(X=5)=21×0.088567×0.1521≈0.282711×0.1521≈0.043004.
Round to nearest thousandth: Round the answer to the nearest thousandth.The probability P(X=5) rounded to the nearest thousandth is:0.043.
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