During a single day at radio station WMZH, the probability that a particular song is played is 0.52 . What is the probability that this song will be played on at least 5 days out of 7 days? Round your answer to the nearest thousandth.Answer:
Q. During a single day at radio station WMZH, the probability that a particular song is played is 0.52 . What is the probability that this song will be played on at least 5 days out of 7 days? Round your answer to the nearest thousandth.Answer:
Introduction: To solve this problem, we need to use the binomial probability formula, which is P(X=k)=C(n,k)⋅pk⋅(1−p)(n−k), where:- P(X=k) is the probability of k successes in n trials,- C(n,k) is the number of combinations of n items taken k at a time,- p is the probability of success on a single trial, and- (1−p) is the probability of failure on a single trial.In this case, a "success" is the song being played on a given day, and we want to find the probability of at least 5 successes in P(X=k)0 days.
Calculate Probability of 5 Days: First, we calculate the probability of the song being played exactly 5 days out of 7. We use the binomial coefficient C(7,5) to determine the number of ways to choose 5 days out of 7, and then multiply by the probability of success raised to the power of 5 and the probability of failure raised to the power of 2.C(7,5)=5!×(7−5)!7!=21P(X=5)=21×(0.52)5×(1−0.52)2
Calculate Probability of 6 Days: Next, we calculate the probability of the song being played exactly 6 days out of 7. C(7,6)=6!⋅(7−6)!7!=7P(X=6)=7⋅(0.52)6⋅(1−0.52)1
Calculate Probability of 7 Days: Then, we calculate the probability of the song being played all 7 days. C(7,7)=7!×(7−7)!7!=1P(X=7)=1×(0.52)7×(1−0.52)0
Calculate Total Probability: Now, we add the probabilities of the song being played exactly 5, 6, and 7 days to get the total probability of it being played at least 5 days out of 7.P(X≥5)=P(X=5)+P(X=6)+P(X=7)
Perform Calculations and Sum: We perform the calculations for each case and sum them up. P(X=5)=21×(0.52)5×(0.48)2P(X=5)≈21×0.0387×0.2304P(X=5)≈0.1975P(X=6)=7×(0.52)6×(0.48)1P(X=6)≈7×0.0202×0.48P(X=6)≈0.0679P(X=7)=1×(0.52)7×(1)0P(X=7)≈1×0.0105P(X=7)≈0.0105P(X≥5)=P(X=5)+P(X=6)+P(X=7)P(X=5)≈21×0.0387×0.23040P(X=5)≈21×0.0387×0.23041
Finalize Answer: Finally, we round the answer to the nearest thousandth as requested. P(X≥5)≈0.276
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