Mastering Linear Interpolation

Linear Interpolation

A visual, intuitive playground designed to help GCSE Statistics students understand *why* we interpolate, rather than just memorising formulas.

Step-by-step visualizer with an animated table, dynamic continuous number lines, and live ratio calculations.

Launch Teaching Mode

procedurally generated median drills. Choose step-by-step scaffolding or quick independent practice.

Spot typical errors in calculations—such as using the wrong interval widths or incorrect boundaries.

Start Hunting

Data Dropping Timeline Slider

Step 0: Raw Table Overview

Raw Table Calculate CF Group 1 Group 2 Group 3 Group 4 Find Target Calculate

Grouped table of baggage check-ins. Let's find the median weight.

Weight (w kg)	Frequency (f)	Cum. Frequency (CF)
Total (N)	40	40

Interval Data Points

Target Interval Points

Interpolation Target

Select Continuous Dataset

Target Statistic

Fill in the missing values and calculate the final estimate.

Class Interval	Freq (f)	Cum. Freq (CF)
Total (N)	-

1. Fill out the Cumulative Frequency column

Type the running totals into the empty boxes on the table.

2. What is the exact target position?

3. Substitute values into the formula

Replace the letters with the correct numbers from your table.

+ (

) ×

4. Calculate the final interpolated estimate

Apply the formula and provide your answer to 2 decimal places.

One of the highlighted values below is incorrect. Click the mistake!

Class Interval	Freq (f)	Cum. Freq (CF)
Total (N)	-

1. Target Position

Target =

2. Formula Substitution

+ (

) ×