The chance that you will be ticketed illegal parking on campus is about 1/3. Dur

Question

The chance that you will be ticketed illegal parking on campus is about 1/3. During the last nine days, you have illegally parked every day and have not been ticketed (you lucky person)! Today, on the 10^th day, you decide to part illegally. The chances that you will be caught are: a. Greater than 1/3 because you were not caught in the last nine days. b. Less than 1/3 because you were not caught in the last nine days. c. Still equal to 1/3 because the last nine days do not affect the probability. d. Equal to 1/10 because you were not caught in the last nine days. e. Equal to 9/10 because you were not caught in the last nine days. The chance that a person will contract AIDS after sexual contact with an infected partner has been estimated to be 1/4. This means: a. A person will be infected after exactly 4 sexual contacts with infected partners. b. Of 1000 people having sexual contacts with infected partners, exactly 250 will become infected. c. Of 200 people having sexual contacts with infected partners, about 50 will become infected. d. In exactly 25% of all sexual contacts with infected partners, the infection will spread. e. Of 20 people having sexual contacts with infected partners, it is very likely that exactly 5 people will become infected. It has been estimated that about 20% of people between the ages of 18 and 25 have uses marijuana in the last year. Which of the following is CORRECT about this statement? a. Five people of this age group were randomly selected. This means that exactly one of them must have used marijuana in the last year. b. Twenty people were randomly selected form this age group. Eighteen of them use marijuana in the last year. The next person selected at random will have a lower probability of using marijuana. c. Ten people were randomly selected from this age group. None of them have used marijuana in the last year. The next person selected must have a higher probability of using marijuana in the last year. d. A thousand people from the age group were randomly selected. It is not unusual to find that 217 of them have used marijuana in the last year. e. A million people from this age group were randomly selected. There must be exactly 200,000 of them that have used marijuana in the last year.

Explanation / Answer

1)

Option C

the probability does not affected by the pevious days

it always remails same

2)

option A

it means the person will be infected after exactly 4 sexual contacts with the infected patners

3)

option A is correct

Five people of this age group are selected of these 5 one of them must have used marijuana this indicates the probability of 0.2 i.e 20%

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