Question

14. In a​ survey, 161 respondents say that they never use a credit​ card, 1220 say that they use it​ sometimes, and 2828 say that they 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

​(Round to three decimal places as​ needed.)

15. Among 400 randomly selected drivers in the 16−18 age​ bracket, 374 were in a car crash in the last year. If a driver in that age bracket is randomly​ selected, what is the approximate probability that he or she will be in a car crash during the next​ year? Is it unlikely for a driver in that age bracket to be involved in a car crash during a​ year? Is the resulting value high enough to be of concern to those in the 16−18 age ​bracket? Consider an event to be​ "unlikely" if its probability is less than or equal to 0.05.

The probability that a randomly selected person in the 16−18 age bracket will be in a car crash this year is approximately _____.

​(Type an integer or decimal rounded to the nearest thousandth as​ needed.)

It is unlikely for a driver in that age bracket to be involved in a car crash during a year?

Is the resulting value high enough to be of concern to those in the 16 – 18 age bracket? Consider an event to be "unlikely" if its probability is less than or equal to 0.05.

Answer 1