Mean (Average)

Mean = (Total of all numbers) ÷ (Number of values)

Median

Arrange the numbers in order and find the middle value.

Odd number of values: 3, 5, 9 → Median = 5

Even number of values: 2, 4, 6, 8 → Median = (4 + 6) ÷ 2 = 5