Represent Numeric Data Graphically Using Stem and Leaf

The stem and leaf plot below shows the grade point averages of 18 students. The digit in the stem represents the ones and the digit in the leaf represents the tenths. So for example 0 | 8 = 0.8, 1 | 2 = 1.2 and so on.

What is the range of the data in the stem and leaf plot?

• 3.2

• 3.1

• 3.5

• 32

How many students have a grade of 2 or more?

• 1

• 11

• 12

• 10

What is the mode of the grades?

• 4.0

• 1.4 and 2.5

• 1.4

• 2.5

What is the median (middle) of the grades?

• 2.0

• 2.6

• 2.4

• 2.5

The back to back stem and leaf plot below shows the exam grades (out of 100) of two sections. The digit in the stem represents the tens and the digit in the leaf represents the ones.

How many students scored higher than 60 in section 1?

• 20

• 21

• 22

• 19

How many students scored higher than 60 in section 2?

• 17

• 18

• 16

• 20

What are the minimum and maximum scores in section 1?

• minimum = 40 , maximum = 95

• minimum = 95 , maximum = 40

• minimum = 91 , maximum = 90

• minimum = 90 , maximum = 41

What are the minimum and maximum scores in section 2?

• minimum = 45 , maximum = 90

• minimum = 40 , maximum = 95

• minimum = 41 , maximum = 91

• minimum = 45 , maximum = 91

Which section has more students scoring 80 or more?

• Section 3

• Section 1

• Section 2

• Both same

The back to back stem and leaf plot below shows the LDL cholesterol levels (in milligram per deciliter mg/dL) of two groups of people, smokers and non smokers. The digits in the stem represents the hundreds and tens and the digit in the leaf represents the ones.

People with a cholesterol level of 129 or less are said to have a near ideal level of cholesterol. How many people, in each group, have a near ideal level of cholesterol?

• smokers: 5 people , non smokers: 10 people

• smokers: 2 people , non smokers: 12 people

• smokers: 3 people , non smokers: 13 people

• smokers: 4 people , non smokers: 13 people