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Dot Plots: Finding the Mean — Easy Worksheet 1
Grade 10 · Whoobee Name: ____________________ Date: __________
Find the mean of the data in each dot plot. Round to the nearest tenth when the mean is not a whole number.
How to solve
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Example
The dot plot shows the number of hours of sleep for 7 students. Each dot stands for one student. The same data as a list: S = [4, 7, 8, 10, 3, 6, 4]. What is the mean number of hours of sleep?
Answer: 6
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 3 + 5 + 7 + 9 + 10 + 2 × 11 = 56. There are 7 dots, so the mean = sum ÷ number of values = 56 ÷ 7 = 8.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 3 + 5 + 7 + 9 + 10 + 2 × 11 = 56. There are 7 dots, so the mean = sum ÷ number of values = 56 ÷ 7 = 8.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of push-ups done in one minute for 7 students. Each dot stands for one student. The same data as a list: S = [21, 15, 13, 14, 22, 13, 21]. What is the mean number of push-ups done in one minute?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 21 + 22 + 23 + 3 × 25 + 27 = 168. There are 7 dots, so the mean = sum ÷ number of values = 168 ÷ 7 = 24.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 21 + 22 + 23 + 3 × 25 + 27 = 168. There are 7 dots, so the mean = sum ÷ number of values = 168 ÷ 7 = 24.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the quiz score for 8 students. Each dot stands for one student. The same data as a list: S = [13, 14, 13, 15, 14, 17, 18, 16]. What is the mean quiz score?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 5 + 6 + 2 × 8 + 2 × 9 + 13 + 14 = 72. There are 8 dots, so the mean = sum ÷ number of values = 72 ÷ 8 = 9.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 5 + 6 + 2 × 8 + 2 × 9 + 13 + 14 = 72. There are 8 dots, so the mean = sum ÷ number of values = 72 ÷ 8 = 9.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of push-ups done in one minute for 7 students. Each dot stands for one student. The same data as a list: S = [29, 28, 23, 19, 19, 21, 22]. What is the mean number of push-ups done in one minute?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 9 + 11 + 3 × 12 + 17 + 18 = 91. There are 7 dots, so the mean = sum ÷ number of values = 91 ÷ 7 = 13.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 9 + 11 + 3 × 12 + 17 + 18 = 91. There are 7 dots, so the mean = sum ÷ number of values = 91 ÷ 7 = 13.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of books read over the summer for 7 students. Each dot stands for one student. The same data as a list: S = [3, 2, 10, 2, 7, 3, 1]. What is the mean number of books read over the summer?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 1 + 6 + 7 + 8 + 9 + 3 × 11 = 64. There are 8 dots, so the mean = sum ÷ number of values = 64 ÷ 8 = 8.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 1 + 6 + 7 + 8 + 9 + 3 × 11 = 64. There are 8 dots, so the mean = sum ÷ number of values = 64 ÷ 8 = 8.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of rainy days for 8 months. Each dot stands for one month. The same data as a list: S = [24, 16, 17, 16, 20, 20, 23, 16]. What is the mean number of rainy days?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 2 × 11 + 15 + 16 + 17 + 18 + 2 × 20 = 128. There are 8 dots, so the mean = sum ÷ number of values = 128 ÷ 8 = 16.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 2 × 11 + 15 + 16 + 17 + 18 + 2 × 20 = 128. There are 8 dots, so the mean = sum ÷ number of values = 128 ÷ 8 = 16.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of goals scored for 7 matches. Each dot stands for one match. The same data as a list: S = [2, 4, 3, 3, 5, 5, 6]. What is the mean number of goals scored?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 23 + 24 + 2 × 28 + 29 + 30 + 2 × 31 = 224. There are 8 dots, so the mean = sum ÷ number of values = 224 ÷ 8 = 28.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 23 + 24 + 2 × 28 + 29 + 30 + 2 × 31 = 224. There are 8 dots, so the mean = sum ÷ number of values = 224 ÷ 8 = 28.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of text messages sent in one hour for 8 teens. Each dot stands for one teen. The same data as a list: S = [15, 13, 13, 9, 16, 12, 8, 10]. What is the mean number of text messages sent in one hour?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 2 × 3 + 2 × 4 + 6 + 7 + 9 + 12 = 48. There are 8 dots, so the mean = sum ÷ number of values = 48 ÷ 8 = 6.
✓ Correct!
Not quite. The answer is
💡 Each dot is one value, so a number with 3 dots above it is counted 3 times (3 × that number). Add all the values: 2 × 3 + 2 × 4 + 6 + 7 + 9 + 12 = 48. There are 8 dots, so the mean = sum ÷ number of values = 48 ÷ 8 = 6.
💡 How to solve: Dot Plots: Finding the Mean
Each dot is one data value, so read every dot (a stack of 3 dots above 6 means 6 appears 3 times). Mean = (sum of all the values) ÷ (number of values). Example: S = [2, 4, 4, 6] has sum 16 and 4 values, so the mean is 16 ÷ 4 = 4.
Try a similar one
The dot plot shows the number of text messages sent in one hour for 7 teens. Each dot stands for one teen. The same data as a list: S = [15, 14, 10, 14, 12, 19, 14]. What is the mean number of text messages sent in one hour?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Dot Plots: Finding the Mean — Easy Worksheet 1
Find the mean of the data in each dot plot. Round to the nearest tenth when the mean is not a whole number.