Dot Plots Notes and Worksheets - Lindsay Bowden - Free Printable

Let’s solve each question step by step.

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First, let’s understand the dot plot.

The dot plot shows how many minutes it took students to eat lunch. Each dot = 1 student.

Here’s what we see:

- 1 minute → 1 dot → 1 student
- 2 minutes → 2 dots → 2 students
- 3 minutes → 1 dot → 1 student
- 4 minutes → 3 dots → 3 students
- 5 minutes → 1 dot → 1 student
- 6 minutes → 4 dots → 4 students
- 7 minutes → 0 dots → 0 students
- 8 minutes → 2 dots → 2 students
- 9 minutes → 3 dots → 3 students
- 10 minutes → 2 dots → 2 students

Total students = add all dots:
1 + 2 + 1 + 3 + 1 + 4 + 0 + 2 + 3 + 2 = 19 students

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Question 1: How many students took 8 or more minutes?

“8 or more” means 8, 9, and 10 minutes.

- 8 min → 2 students
- 9 min → 3 students
- 10 min → 2 students

Add them: 2 + 3 + 2 = 7 students

✔ Answer for Q1: 7

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Question 2: What percentage of students ate their lunch in 5 minutes or less?

“5 minutes or less” = 1, 2, 3, 4, 5 minutes.

Count those dots:

- 1 min → 1
- 2 min → 2
- 3 min → 1
- 4 min → 3
- 5 min → 1

Total = 1 + 2 + 1 + 3 + 1 = 8 students

Total students overall = 19 (from earlier)

Percentage = (part / whole) × 100
= (8 / 19) × 100

Let’s calculate that:

8 ÷ 19 ≈ 0.42105
× 100 ≈ 42.1%

We can round to one decimal place → 42.1%

✔ Answer for Q2: 42.1%

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Question 3: What is the average time it takes this group of students to eat their lunch?

Average = total time for all students ÷ number of students

We need to find the sum of all times.

Multiply each time by how many students took that long:

- 1 min × 1 student = 1
- 2 min × 2 students = 4
- 3 min × 1 student = 3
- 4 min × 3 students = 12
- 5 min × 1 student = 5
- 6 min × 4 students = 24
- 7 min × 0 students = 0
- 8 min × 2 students = 16
- 9 min × 3 students = 27
- 10 min × 2 students = 20

Now add them up:

1 + 4 = 5
5 + 3 = 8
8 + 12 = 20
20 + 5 = 25
25 + 24 = 49
49 + 0 = 49
49 + 16 = 65
65 + 27 = 92
92 + 20 = 112

Total time = 112 minutes
Total students = 19

Average = 112 ÷ 19

Let’s divide:

19 × 5 = 95
112 - 95 = 17 → so 5 and 17/19

As a decimal: 112 ÷ 19 ≈ 5.8947...

Round to two decimal places → 5.89 minutes

✔ Answer for Q3: 5.89 minutes

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Final Answer:
1. 7
2. 42.1%
3. 5.89 minutes