If the probability that the Islanders will beat the Rangers in a game is 67%, what is the probability that the Islanders will win at least four 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 67%, what is the probability that the Islanders will win at least four out of seven games in a series against the Rangers? Round your answer to the nearest thousandth.Answer:
Understand the problem: Understand the problem and determine the approach.We need to calculate the probability of the Islanders winning at least 4 out of 7 games. This is a binomial probability problem because each game has two outcomes (win or lose), and we want to find the probability of a certain number of wins in a fixed number of trials (games).
Calculate wins probability: Calculate the probability of winning exactly 4, 5, 6, and 7 games.We will use the binomial probability formula: P(X=k)=C(n,k)⋅pk⋅(1−p)n−k, where:- P(X=k) is the probability of k wins,- C(n,k) is the combination of n games taken k at a time,- 50 is the probability of winning one game (51 or 52),- n is the total number of games (7),- k is the number of games won (which we will calculate for 4, 5, 6, and 7).
Calculate 4 games probability: Calculate the probability of winning exactly 4 games.Using the binomial formula, we find P(X=4):C(7,4)⋅0.674⋅(1−0.67)7−4=35⋅0.674⋅0.333=35⋅0.20151121⋅0.035937=35⋅0.007237≈0.2533
Calculate 5 games probability: Calculate the probability of winning exactly 5 games. Using the binomial formula, we find P(X=5): C(7,5)⋅0.675⋅(1−0.67)7−5 = 21⋅0.675⋅0.332 = 21⋅0.13207934⋅0.1089 = 21⋅0.014379≈0.3019
Calculate 6 games probability: Calculate the probability of winning exactly 6 games.Using the binomial formula, we find P(X=6):C(7,6)⋅0.676⋅(1−0.67)(7−6)=7⋅0.676⋅0.331=7⋅0.08803834⋅0.33=7⋅0.029046≈0.2033
Calculate 7 games probability: Calculate the probability of winning all 7 games.Using the binomial formula, we find P(X=7):C(7,7)×0.677×(1−0.67)(7−7)=1×0.677×0.330=1×0.06706822×1=0.06706822≈0.0671
Calculate total probability: Add the probabilities of winning exactly 4, 5, 6, and 7 games to find the total probability of winning at least 4 games.Total probability = P(X=4)+P(X=5)+P(X=6)+P(X=7)≈0.2533+0.3019+0.2033+0.0671≈0.8256
Round total probability: Round the total probability to the nearest thousandth. Rounded probability = 0.826
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