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Dot Plots: Finding the Mean — Easy Worksheet 2
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: 9 + 10 + 13 + 15 + 3 × 18 + 19 = 120. There are 8 dots, so the mean = sum ÷ number of values = 120 ÷ 8 = 15.
✓ 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 + 10 + 13 + 15 + 3 × 18 + 19 = 120. There are 8 dots, so the mean = sum ÷ number of values = 120 ÷ 8 = 15.
💡 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 = [12, 18, 23, 19, 24, 19, 22, 15]. 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: 3 + 5 + 2 × 7 + 8 + 2 × 11 + 12 = 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: 3 + 5 + 2 × 7 + 8 + 2 × 11 + 12 = 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 books read over the summer for 9 students. Each dot stands for one student. The same data as a list: S = [11, 6, 3, 13, 2, 10, 7, 8, 3]. 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: 3 × 18 + 19 + 20 + 2 × 23 + 24 + 26 = 189. There are 9 dots, so the mean = sum ÷ number of values = 189 ÷ 9 = 21.
✓ 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 × 18 + 19 + 20 + 2 × 23 + 24 + 26 = 189. There are 9 dots, so the mean = sum ÷ number of values = 189 ÷ 9 = 21.
💡 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 points scored for 9 games. Each dot stands for one game. The same data as a list: S = [24, 14, 20, 21, 18, 21, 15, 16, 22]. What is the mean number of points 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: 3 × 6 + 2 × 7 + 8 + 9 + 14 + 18 = 81. There are 9 dots, so the mean = sum ÷ number of values = 81 ÷ 9 = 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: 3 × 6 + 2 × 7 + 8 + 9 + 14 + 18 = 81. There are 9 dots, so the mean = sum ÷ number of values = 81 ÷ 9 = 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 minutes the bus was late for 8 days. Each dot stands for one day. The same data as a list: S = [7, 7, 8, 10, 2, 8, 0, 6]. What is the mean number of minutes the bus was late?
✓ 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 × 19 + 3 × 23 + 2 × 26 + 27 + 30 = 216. There are 9 dots, so the mean = sum ÷ number of values = 216 ÷ 9 = 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: 2 × 19 + 3 × 23 + 2 × 26 + 27 + 30 = 216. There are 9 dots, so the mean = sum ÷ number of values = 216 ÷ 9 = 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 number of push-ups done in one minute for 8 students. Each dot stands for one student. The same data as a list: S = [26, 20, 24, 26, 20, 24, 26, 18]. 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: 2 × 7 + 8 + 9 + 2 × 10 + 11 + 18 = 80. There are 8 dots, so the mean = sum ÷ number of values = 80 ÷ 8 = 10.
✓ 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 × 7 + 8 + 9 + 2 × 10 + 11 + 18 = 80. There are 8 dots, so the mean = sum ÷ number of values = 80 ÷ 8 = 10.
💡 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 minutes the bus was late for 8 days. Each dot stands for one day. The same data as a list: S = [3, 6, 2, 1, 11, 8, 7, 2]. What is the mean number of minutes the bus was late?
✓ 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: 7 + 3 × 9 + 11 + 14 + 15 + 16 + 18 = 108. There are 9 dots, so the mean = sum ÷ number of values = 108 ÷ 9 = 12.
✓ 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: 7 + 3 × 9 + 11 + 14 + 15 + 16 + 18 = 108. There are 9 dots, so the mean = sum ÷ number of values = 108 ÷ 9 = 12.
💡 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 8 matches. Each dot stands for one match. The same data as a list: S = [4, 3, 1, 0, 3, 3, 9, 9]. 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: 2 × 6 + 7 + 3 × 8 + 10 + 12 + 16 = 81. There are 9 dots, so the mean = sum ÷ number of values = 81 ÷ 9 = 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: 2 × 6 + 7 + 3 × 8 + 10 + 12 + 16 = 81. There are 9 dots, so the mean = sum ÷ number of values = 81 ÷ 9 = 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 minutes the bus was late for 9 days. Each dot stands for one day. The same data as a list: S = [11, 15, 14, 10, 8, 6, 7, 8, 11]. What is the mean number of minutes the bus was late?
✓ 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 2
Find the mean of the data in each dot plot. Round to the nearest tenth when the mean is not a whole number.