Create histograms

key notes :

Definition of a Histogram

• A histogram is a type of bar graph that represents data in groups (or intervals) instead of individual numbers.

Understanding Data Intervals

• Data is divided into equal-sized intervals (e.g., 0–10, 11–20, etc.).
• Each interval has a corresponding frequency (how many times data falls into that range).

Difference Between a Histogram and a Bar Graph

• In a histogram, bars touch each other because data is continuous.
• In a bar graph, bars are separated because data categories are distinct.

Steps to Create a Histogram

Collect and organize data (e.g., test scores, heights, or ages).

Choose suitable intervals (equal width, like 0–5, 6–10, etc.).

Make a frequency table to count how many values fall into each interval.

Draw and label axes:

• X-axis: Represents the intervals.
• Y-axis: Represents frequency (number of occurrences).

Draw bars for each interval (height of the bar shows frequency).

Reading a Histogram

• Identify the highest and lowest frequencies.
• Compare different intervals to see trends in data.
• Understand patterns (e.g., most common values).

Real-Life Applications

• Analyzing test scores in a class.
• Checking temperature variations over a month.
• Understanding the number of books read by students in a library.

Common Mistakes to Avoid

• Using unequal intervals.
• Leaving gaps between bars.
• Forgetting to label axes properly.

Learn with an example

Let’s practice!🖊️