Lesson Notes By Weeks and Term v4 - JHS 1

Lesson Video

This page supports the lesson note with a companion video and a short classroom-ready summary.

For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.

Performance objectives

• Define the median and its significance.
• Organize ungrouped data.
• Calculate the median for both odd and even sets of data.
• Interpret the median in a real-life scenario.

Lesson summary

This lesson introduces the concept of the median, which is one of the ways we measure the "centre" or "middle" of a set of data. Imagine lining up all the students in your class according to their height, from the shortest to the tallest. The person standing exactly in the middle represents the median height. In real life, understanding the median helps us make sense of information around us, from test scores in our class to the prices of goods at the market. It gives us a typical value that is not easily affected by extremely high or low numbers.

Lesson notes

This section explains all the important ideas you need to understand and calculate the median. What is Ungrouped Data?

Ungrouped data is simply a list of numbers or values. It is raw information that has not been organised into groups or tables. Example: The marks of 7 students in a quiz: `15, 12, 18, 9, 16, 20, 14`. What is the Median?

The median is the middle value in a set of data *after* the data has been arranged in order from the smallest to the largest (ascending order) or from the largest to thesmallest (descending order).

The most important first step is to ALWAYS arrange the data in order! If you forget this step, your answer will be wrong.