College Math Placement Test Statistics 2

Question 1

A dataset has values 4, 8, 6, 5, 3, 2, 8, 9, 8, 1. What is the mode?

Accepted Answer

8

Answer

6

Answer

5.4

Answer

5.5

Question 2

Which measure of central tendency is most affected by extreme outliers?

Accepted Answer

Mean

Answer

Median

Answer

Mode

Answer

Range

Question 3

A sample of 5 test scores has a variance of 36. What is the standard deviation?

Accepted Answer

6

Answer

18

Answer

1296

Answer

7.2

Question 4

In a normal distribution, approximately what percentage of data falls within one standard deviation of the mean?

Accepted Answer

68%

Answer

50%

Answer

95%

Answer

99.7%

Question 5

A bag contains 4 red, 3 blue, and 5 green marbles. What is the probability of drawing a blue marble?

Accepted Answer

3/12

Answer

1/4

Answer

1/3

Answer

1/5

Question 6

If two events A and B are mutually exclusive, which statement is true?

Accepted Answer

P(A and B) = 0

Answer

P(A and B) = P(A) × P(B)

Answer

P(A or B) = P(A) × P(B)

Answer

P(A and B) = P(A) + P(B)

Question 7

A frequency table shows Class 1: 10 students, Class 2: 15 students, Class 3: 5 students. What is the relative frequency of Class 2?

Accepted Answer

0.5

Answer

15%

Answer

50%

Answer

15/30