Quick answer

Every example uses the arithmetic mean: add the percentages, divide by how many you added.

Formula

  • Arithmetic mean = (p₁ + p₂ + … + pₙ) ÷ n
  • In words: add the comparable percentages, divide by how many you added.

Introduction

Start by reading the scenario line, what makes these percentages comparable? Then copy the mechanical steps into your notes or spreadsheet, or mirror the same numbers on the Average Percentage Calculator to confirm the mean.

After two or three patterns, the steps feel automatic. The remaining skill is knowing when not to average, which the “when not to” article covers.

What is it?

Worked examples are deliberate rehearsals: same formula, different numbers, full transparency on intermediate totals. The underlying steps match the longer walkthrough in how to calculate an average percentage.

They are training wheels, not proof that every real dataset behaves this nicely.

Formula (arithmetic mean)

  • Arithmetic mean = (p₁ + p₂ + … + pₙ) ÷ n
  • In words: add the comparable percentages, divide by how many you added.

The mean does not “know” whether your values are quiz scores, completion rates, or growth figures, you decide whether they belong in the same average.

Step-by-step guide

  1. List the values. Write them in a column to avoid dropping one mentally.
  2. Compute the sum. Add once, then add again from the bottom up as a habit.
  3. Count n. Confirm n matches the number of terms in the sum.
  4. Divide. Quotient is the mean; keep extra decimals until you present.
  5. Sanity check. Mean should sit between the smallest and largest inputs.

Example

Example A: 80%, 88%, 92%: sum 260, n 3, mean ≈ 86.667%. Example B: 15%, 20%, 20%, 25%: sum 80, n 4, mean 20%. Example C: 70%, 70%, 91%: sum 231, n 3, mean 77%.

Type any trio into the calculator to verify you are reading the examples correctly.