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Data & Graphs

Turn numbers into pictures — and discover what they tell you

Every decision you make — from choosing a phone plan to voting on school policy — improves when you can read data. Numbers by themselves can be hard to understand. But when you turn them into a bar chart, patterns jump out immediately. Which test had the highest score? Which month had the most rain? A chart answers these questions at a glance.

In this lesson, six test scores are already shown as bars on the graph. The AI tutor will help you find the mean (average), median (middle value), max, min, and range — all by looking at the bars.

This is your first step into statistics — the math of real-world data.

Graph

FAQ

What is a bar chart?
A bar chart uses rectangles (bars) to show data. The height of each bar represents a value. Taller bars = bigger numbers. Bar charts make it easy to compare values side by side.
What is the mean (average)?
The mean is the sum of all values divided by how many there are. For scores 72, 85, 91, 68, 88, 95: mean = (72+85+91+68+88+95) ÷ 6 = 499 ÷ 6 ≈ 83.2. It tells you the "typical" value.
What is the median?
The median is the middle value when data is sorted. Sort the scores: 68, 72, 85, 88, 91, 95. With 6 values, the median is the average of the 3rd and 4th: (85+88) ÷ 2 = 86.5.
What are max, min, and range?
The max is the largest value (95). The min is the smallest (68). The range is max − min = 95 − 68 = 27. Range tells you how spread out the data is.