Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Mathematics

Z-Scores (Standard Scores)

Quick fact

In a normal distribution, approximately 68% of all data points have a z-score between -1 and 1, 95% between -2 and 2, and 99.7% between -3 and 3.

Why this is interesting

Imagine you scored 85 on a math test and 70 on a physics test. Which subject did you perform better in? Without knowing the difficulty of each test, how can you fairly compare?