Averages and range

An average is one number that sums up a set of data. There are three kinds, plus the range for how spread out it is.

Key facts

  • Mean: add them all up and divide by how many.
  • Median: the middle value when they’re in order.
  • Mode: the most common value.
  • Range: biggest take away smallest.

Worked examples

Example 1

Find the mean of 4, 8, 9, 11, 13.

  1. Add them. 4 + 8 + 9 + 11 + 13 = 45
  2. Divide by how many (5). 45 ÷ 5 = 9

Answer: 9

Questions about averages and range