The average that lied — Data Analyst · Pretender

A fictional school survey asked students to rate lunch from 1 to 5. Some left the answer blank (stored as null). The current code says the average is 2.1 — suspiciously low. Fix it. Make the average count only real answers.

Code checks · ~4 min

Your role

You're the data analyst (in this game).

Your goal

Make the average count only real answers.

What you know

Blank answers are not zeros: nobody gave lunch a 0.

Limits

If nobody answered, return null instead of crashing.

Success looks like

Clean data — Blanks were removed.
Edge case — No answers doesn't crash.
Right divisor — You divided by the real answers.

Skills you used

Logical thinking — Following steps and rules precisely.
Debugging — Finding what's wrong and why.

In real life

Handling missing values is one of a data analyst's most common tasks: treating blanks as zeros is a classic mistake that can change conclusions.

Data Analyst

Turn numbers into honest answers.

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