Statistics · Module 5 · The normal distribution and z-scores

Normal Distribution Walkthrough

Watch probability turn into area under a curve, see how μ and σ move and stretch the bell, then learn z-scores, the empirical rule, areas left, right and between, and how to work backwards from a percentile. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · Statistics Study Tools · CC BY-NC-SA 4.0
Use the left and right arrow keys to move between steps. Practice next in the Normal Distribution Lab. Every data set here uses made-up practice numbers chosen to look realistic; they are not clinical reference values. Areas are computed with an accurate normal CDF and rounded to four decimal places, so they match a printed z-table.