ERB Data Analysis and Statistics 2

Question 1

A bag contains 4 red marbles, 3 blue marbles, and 5 green marbles. If one marble is chosen at random, what is the probability of selecting a blue marble?

Accepted Answer

3/12

Answer

1/4

Answer

1/3

Answer

3/4

Question 2

A frequency table shows that in a class, 6 students scored 60–69, 10 scored 70–79, 8 scored 80–89, and 4 scored 90–99. How many students are in the class?

Accepted Answer

28

Answer

24

Answer

26

Answer

30

Question 3

A scatter plot shows data points generally moving from the lower-left to the upper-right of the graph. What type of correlation does this represent?

Accepted Answer

Positive correlation

Answer

Negative correlation

Answer

No correlation

Answer

Inverse correlation

Question 4

The high temperatures for one week were: 72, 75, 68, 74, 70, 85, 71. Which value is most likely an outlier?

Accepted Answer

85

Answer

72

Answer

70

Answer

74

Question 5

A pie chart shows how a student spends 24 hours: Sleep 33%, School 29%, Homework 17%, Free Time 13%, Other 8%. How many hours does the student spend on homework?

Accepted Answer

4.08 hours

Answer

4 hours

Answer

3 hours

Answer

5 hours

Question 6

Two data sets have the same mean of 50. Set A has a range of 10, and Set B has a range of 60. What can you conclude?

Accepted Answer

Set B's data is more spread out than Set A's

Answer

Set B has more data points than Set A

Answer

Set A's data is more spread out than Set B's

Answer

Both sets have the same distribution

Question 7

A table shows that a plant grew 2 cm in Week 1, 4 cm in Week 2, 6 cm in Week 3, and 8 cm in Week 4. If the pattern continues, how much will the plant grow in Week 6?

Accepted Answer

12 cm

Answer

10 cm

Answer

14 cm

Answer

16 cm