JM31 · Lesson 31
Measures of Central Tendencies
Drop and drag data on a number line, tip the mean like a balance beam, clear short missions, then explore transforms and which average fits each context.
Concept & Formula
Coming soon.
Lab 1 · Mean · Median · Mode
Play with the averages
Drop points on the number line, drag them around, and watch mean / median / mode chase the data. Type a value only if you need a precise number.
Click empty space on the line to drop a point · drag a blue dot to move · double-click a dot to remove
How often each score appears (0–10)
Music exam — which part counts more?
Edit the first three weights; the last one fills whatever is left to 100%. The coloured strip shows each part’s share of the overall score.
Bigger share pulls the overall score toward that part’s mark.
Story: Four classmates scored 2, 4, 6, 8 in a mini-quiz. A transfer student then scores 20 — far above everyone else.
Watch the balance before and after the “genius” joins.
Which average jumped farther when the score 20 arrived?
Which average fits?
Read the data and context — pick the best average for each scenario.
Lab 2 · Shift & stretch
Everyone moves together
Imagine every student gets the same bonus (+), or every score is scaled (×). Watch the dots slide or stretch — the three averages move the same way.
Before
After
Game
Coming soon.
Read each page. When a concept finishes, answer the two follow-up questions. They stay on this tab only.
Summary
Coming soon.
Pick a section quiz, answer each question, use Next to move on. Submit on the last question to see all results.