How to Write Averages in Articles- Style and Format Guide

Why How You Write Averages Matters

Most writers mess this up. They either spell out every number or dump numerals everywhere without consistency. Neither looks professional.

Your style choices around averages affect readability. They also affect whether readers trust your data. Inconsistent formatting screams "amateur."

What Is an Average, Anyway?

An average is a single number that represents a set of numbers. In statistics, there are three main types:

• Mean – add all values, divide by count. What most people mean when they say "average."
• Median – the middle value when you line everything up. Better when outliers skew things.
• Mode – the most frequent value. Useful for categorical data.

Most articles use the mean. But you should know which one you're using before you write it.

The Basic Rules for Writing Averages

Spell Out vs. Use Numerals

The universal rule: spell out numbers one through nine, use numerals for 10 and above.

So "three participants" but "15 respondents." This applies to averages too.

But there are exceptions. Most style guides say:

• Use numerals when comparing three or more numbers in a sentence
• Use numerals for numbers at the start of a sentence (or reword)
• Use numerals with units of measurement

When to Use Numerals

Use numerals when:

• The number is 10 or higher
• You're showing exact statistics
• Data precision matters
• You're comparing multiple figures

When to Spell It Out

Spell it out when:

• The number is below 10
• You're writing for a general audience
• The number is vague (not a specific statistic)

Style Guide Recommendations

Different style guides have different rules. Here's how the major ones handle averages:

Notice the pattern? All the major guides agree. The differences are minor—mostly around specific contexts like time, percentages, and decimals.

Mean, Median, or Mode: Which One to Use?

Don't just pick one because it sounds right. Here's when each makes sense:

Use the Mean When:

• Your data is evenly distributed
• You don't have extreme outliers
• You want to show the "typical" value

Example: Average household income in a middle-class suburb.

Use the Median When:

• You have outliers that would skew the mean
• You want to show the "middle" value
• Income data (which often has extreme highs)

Example: Median home price in a city with mansions and starter homes.

Use the Mode When:

• You're dealing with categorical data
• You want the most common response
• You're analyzing frequency

Example: Most common answer on a survey question.

Common Mistakes to Avoid

Mistake 1: Inconsistent Formatting

Bad: "The study found that 8 participants finished in an average of 24 minutes."

Better: "The study found that eight participants finished in an average of 24 minutes."

Mistake 2: False Precision

Don't write "the average was 7.4362 seconds" unless that level of precision actually matters. Round to something sensible.

Mistake 3: Mixing Up Mean and Median

Always specify which average you're using. "Average" usually means mean. If you mean median, say median.

Mistake 4: Starting Sentences with Numerals

Bad: "15 people responded to the survey."

Better: "Fifteen people responded to the survey."

Or reword: "Respondents numbered 15."

How to Write Averages: Practical Examples

In Academic Writing

APA style often requires specific formatting:

"The participants had a mean age of 23.4 years (SD = 3.2)."

Include standard deviation when relevant. This gives readers context.

In News Articles

AP style prioritizes clarity:

"Respondents spent an average of $127 per month on groceries."

Keep it conversational. Readers shouldn't need a statistics textbook.

In Business Reports

Clarity + precision:

"Average quarterly revenue was $4.2 million, up from $3.8 million the previous quarter."

Use numerals for comparisons. Include context.

In Technical Writing

Full precision when needed:

"The mean response time was 234.7 milliseconds (median: 198 ms, range: 45-1,203 ms)."

Include all relevant statistics. Your audience expects detail.

Quick Reference: Writing Averages

• Spell out one through nine
• Use numerals for 10 and above
• Always use numerals with units of measurement
• Specify mean, median, or mode—don't assume readers know
• Include context: compare to something, add standard deviation if relevant
• Don't over-precise: round to meaningful figures
• Check your style guide and be consistent

That's it. No fancy tricks. Just apply these rules and your numbers will look professional.