Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For K-12 Students · Win Probability

Win Probability for a bowling roll

Built for k-12 students learning it in middle or high school. Watch the idea come alive with plain-language steps and everyday examples — perfect for projects and homework. Simulate a bowling roll live below — adjust the inputs and watch it respond, right in your browser.

Live Win ProbabilityLive

the odds in real time

Controls

Presets

Lead (points)

Minutes remaining

Scoring volatility

Win probability turns the score and clock into a live percentage. Early on, even a big lead is fragile because plenty of scoring remains; late in the game, the same lead is nearly safe because the uncertainty has shrunk. Modeling the remaining margin as a shrinking random variable produces the classic curve that broadcasts now show on screen.

▶ Run in Python

Data Inspector

Win probability82.5%

Lead+5

Time left10 min

Governing equation

P = \frac{1}{1 + e ^{- 1.7 ℓ / σ_{r}}} = \frac{1}{1 + e ^{- 1.7 \cdot (5) /5.5}} = 82.5%

Reading this result: A 5-point lead is still soft with 10 min on the clock — plenty of scoring remains, keeping win probability near 83%.

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Frequently asked questions

Is this good for k-12 students?: Yes — this version of "Win Probability for a bowling roll" is framed for k-12 students learning it in middle or high school. Watch the idea come alive with plain-language steps and everyday examples — perfect for projects and homework.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.