CLAST Statistics and Probability 3

Question 1

A stem-and-leaf plot shows stems 2, 3, 4 with leaves 2|1 5, 3|0 3 8, 4|2. What is the range of the data set?

Accepted Answer

21

Answer

20

Answer

22

Answer

19

Question 2

Events A and B are mutually exclusive. P(A) = 0.4 and P(B) = 0.25. What is P(A or B)?

Accepted Answer

0.65

Answer

0.1

Answer

0.55

Answer

0.75

Question 3

A frequency table shows: Score 70 (freq 4), 80 (freq 6), 90 (freq 2). What is the mean score?

Accepted Answer

78.3

Answer

80

Answer

79.2

Answer

76.7

Question 4

Which type of graph is BEST suited to display how a quantity changes over time?

Accepted Answer

Line graph

Answer

Pie chart

Answer

Bar graph

Answer

Histogram

Question 5

Two fair coins are flipped. What is the probability of getting exactly one head?

Accepted Answer

1/2

Answer

1/4

Answer

3/4

Answer

1/3

Question 6

A data set has a mean of 50 and a standard deviation of 5. A score of 60 is how many standard deviations above the mean?

Accepted Answer

2

Answer

1

Answer

5

Answer

10

Question 7

In a box-and-whisker plot, what does the box itself represent?

Accepted Answer

The interquartile range (IQR)

Answer

The range of all data

Answer

The mean and median

Answer

The standard deviation