In a survey, 162 respondents say that they never use a credit card, 1223 say that they use it sometimes, and 2831 say that th
ey use it frequently. What is the probability that a randomly selected person uses a credit card frequently? Is it unlikely for someone to use a credit card frequently? How are all of these results affected by the fact that the responses were obtained by those who decided to respond to a survey posted on the Internet? The probability that a randomly selected person uses a credit card frequently is
162 = never use a credit card 1223 = use credit card sometimes 2831 = use a credit card frequently
Probability that a randomly selected person uses a credit card frequently: 1223 / 162 + 1223 + 2831 1223 / 4216 As a percentage, this is about a 29 percent chance. I guess you could say it's unlikely, because the probability is only 29 percent.
The fact that the survey was taken on the internet means it's not really a reliable survey, because only those who have access to the internet would be able to take the survey, which rules out a good group of people.
