Mean, median, mode and range
Key Notes:
📗 When the numbers are arranged from least to greatest, the median is the number in the middle.
📗 The range is the difference between the greatest number and the least number. Subtracting a negative number is the same as adding a positive number.
Learn with an example
✈️ What is the median?
-50, -7, -9, -1, -7, -3
- First, arrange the numbers from least to greatest. Remember that with negative numbers, larger numbers like -9 (if you ignore the minus sign) are less than smaller numbers.
–9,–7,–7,–5,–3,–10
Now find the number in the middle.
–9,–7,–7,–5,–3,–10
The number in the middle is –5. - The median is –5.
✈️ What is the range?
4 8 –2 –3 8 –6 10 1 –5___
- First, find the greatest number. The greatest number is 10.
- Next, find the least number. Remember that with negative numbers, larger numbers like –6 (if you ignore the minus sign) are less than smaller numbers. The least number is –6.
- Subtract the least number from the greatest number:
- 10 − –6 = 10 + 6 = 16
The range is 16.
✈️ What is the mode?
–7 –7 –9 –6 –9 –9 –6 –9
- First, arrange the numbers from least to greatest. Remember that with negative numbers, larger numbers like –9 (if you ignore the minus sign) are less than smaller numbers.
–9–9–9–9–7–7–6–6
Now count how many times each number appears. - –9 appears 4 times.
–7 appears 2 times.
–6 appears 2 times. - The number that appears most often is –9.
- The mode is –9.
Let’s practice!🖊️
