Scores on the SAT test have a mean of 1500 and a standard deviation of 300, while the same characteristics for the ACT test are 25 and 5 respectively. Mark got 1500 for the SAT test and 35 for the ACT test.In which test did Mark do better?

Question 5 options:

SAT

ACT

Which sample do you think has a smaller standard deviation: the incomes of a simple random sample of 1000 adults selected from the general population, or incomes of a simple random sample of 1000 workers in McDonald's ? Explain your answer in a sentence.

Question 6 options:

General, because salaries in general vary much.

McDonald's, because salaries there do not vary much.

General, because the salary variation is largethere.

McDonald's, because salaries therevary much.

In a contest, a participant should selectat randomtwo questions out of five. There are three easy and two difficult questions. Find the probability thatthe participant will select one easy and one difficult question.

(Hint: Make notice, that if the participant is selecting two questions "one-after-another", then we should count samples of the type " easy and thendifficult" and of the type "difficult and then easy" separately.)

Question 7 options:

3/5

3/10

1/2

1/3

On a multiple-choice exam, there are four questions, and each question has threeanswers only one of which is correct. A student just makes random guessing on all four questions.

a) What is the probability that all four answers are non-correct?

Question 8 options:

2/3

1/2

15/81

16/81