SC READY Data Analysis, Statistics & Probability 2

Question 1

The following data set shows quiz scores: 55, 62, 70, 72, 74, 78, 85, 90. What is the median score?

Accepted Answer

73

Answer

72

Answer

74

Answer

70

Question 2

A stem-and-leaf plot shows the following data — Stem 3: leaves 1, 5, 8; Stem 4: leaves 0, 2, 7. What is the greatest value in the data set?

Accepted Answer

47

Answer

40

Answer

38

Answer

42

Question 3

A survey asked 50 students how they travel to school. 20 walk, 15 ride the bus, 10 are driven by car, and 5 ride bikes. Which display would BEST show the percentage each travel method represents?

Accepted Answer

Pie chart

Answer

Bar graph

Answer

Line graph

Answer

Stem-and-leaf plot

Question 4

If you flip a fair coin three times, what is the probability of getting heads all three times?

Accepted Answer

1/8

Answer

1/2

Answer

1/4

Answer

1/6

Question 5

A box-and-whisker plot for a data set shows: minimum = 10, Q1 = 20, median = 35, Q3 = 50, maximum = 70. What is the interquartile range (IQR)?

Accepted Answer

30

Answer

60

Answer

25

Answer

15

Question 6

A student recorded the number of minutes spent on homework each night: 30, 45, 60, 30, 90, 30, 45. After adding one more day with 90 minutes, what happens to the mode?

Accepted Answer

There are now two modes: 30 and 90

Answer

The mode changes to 45

Answer

The mode changes to 90

Answer

The mode stays 30

Question 7

A frequency table shows that 10 students scored 70–79, 15 scored 80–89, and 5 scored 90–99. How many students scored below 90?

Accepted Answer

25

Answer

15

Answer

10

Answer

30