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monkemily1
29.08.2019 •
Mathematics
According to a survey conducted in a certain year by the federal communications commission (fcc) of 3005 adults who were home broadband users, 34.5% of those surveyed had switched their service over the past 3 years. of those who had switched service in the past 3 years, 51% were very satisfied, 39% were somewhat satisfied, and 10% were not satisfied with their service. of the 65.5% who had not switched service in the past 3 years, 48% were very satisfied, 43% were somewhat satisfied, and 9% were not satisfied with their service.
(a) what is the probability that a participant chosen at random had not switched service in the past 3 years and was very satisfied with their service?
(b) what is the probability that a participant chosen at random was not satisfied with their service?
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Ответ:
(a) The probability is 31.44%
(b) The probability is 9.345%
Step-by-step explanation:
The probability for part (a) is calculated as a multiplication of:
65.5% * 48% = 31.44%
Where 65.5% is the percentage of participants that had not switched service in the past 3 years and 48% are the percentage of those 65.5% that were very satisfy. So, the 31.44% of the participants had not switched service in the past 3 years and were very satisfied with their service.
Then, for part b, we have 2 cases:
Case 1: A person that had not had switched service in the past 3 years and was not satisfied with their service Case 2:A person that had not switch in the past 3 years and was not satisfied with their service.So, the probability is calculated as a sum of these two probabilities.
Therefore, the probability for case 1 is calculated as:
34.5% * 10% = 3.45%
Where 34.5% is the percentage of participants that had switched service in the past 3 years and 10% are the percentage of those 34.5% that were not satisfy.
At the same way, the probability for case 2 is:
65.5% * 9% = 5.895%
Finally, the probability that a participant chosen at random was not satisfied with their service is the sum of 3.45% and 5.895%. That is:
3.45% + 5.895% = 9.345%
Ответ:
u just find th answer and if that didn't help ask ur parents btw they will help u they have to