Mean, Median, and Mode

Mean, Median, and Mode

Mean (Average)

Add all values and divide by the count:

$\text{Mean} = \frac{\text{Sum of all values}}{\text{Number of values}}$

Example: Data set: 4, 7, 9, 10, 15

Mean = $\frac{4+7+9+10+15}{5} = \frac{45}{5} = 9$

Median (Middle Value)

Arrange in order and find the middle value.

Odd count: 3, 5, 7, 9, 11 → Median = 7

Even count: 2, 4, 5, 6, 8, 10 → Median = $\frac{5+6}{2} = 5.5$

Mode (Most Frequent)

The value that appears most often.

Data: 2, 3, 3, 5, 7, 3, 8 → Mode = 3