1. Grade 12 Essential Math Measurement and Statistics
Central Tendency
Grade 12 Essential Math
Measurement and Statistics

2. Central Tendency
Measures of central tendency are ways to describe a set (or group) of data
Mean: the average. Includes all data.
Median: the middle number.
Mode: the “most popular” number
Range: how far from minimum to maximum

3. Mean To calculate the mean: Add up all of the values
Divide by the # of values you have

4. Median To calculate the median:
Line up the values in order from smallest to largest
Find the middle value
If there are two middle values, add them up and divide by two.

5. Mode To calculate the mode: Count how many times each value appears.
The mode is the value that appears the most (the most popular value)

6. Range To calculate range: Find the maximum and minimum values
Subtract:
𝑟𝑎𝑛𝑔𝑒=𝑚𝑎𝑥−𝑚𝑖𝑛

7. Example Calculate the mean, median, mode and range of these numbers:45 48 61 23 56 89 22 18 49 66 38 12 99 17
Calculate the mean, median, mode and range of these numbers: