ALLCBTs

Junior Secondary School Mathematics.

Published on Jul 16, 2025 • Education

Hi guys, welcome to today's tutorial on AllCBTs!
Today we'll be tackling a core statistics problem often found in Junior Secondary School math exams — calculating the mean height of students across multiple groups. This question is very relevant for JSS1–JSS3 and is based on weighted average principles.

You can watch the full class in the video below:

The Problem:

The mean height of three groups of students — 20, 16, and 14 students — is 1.67 m, 1.50 m, and 1.40 m ,respectively. What is the mean height of all the students combined?

Step-by-Step Breakdown

Step 1: Group Information

Step 4: Compute the FX Values

Watch more educational videos and past questions: https://youtube.com/@allcbts

Final Answer for Junior Secondary School Mathematics.

The mean height of all the students is 1.54 meters

This method is simple, practical, and often tested in exams. Knowing how to apply the weighted mean formula will help you solve similar questions confidently.

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Meta Description:

Learn how to calculate the mean height of multiple student groups using the weighted average formula. Perfect tutorial for Junior Secondary School students preparing for math exams.

Keywords:
Mean height calculation, JSS math statistics, how to calculate mean, group average math question, weighted average formula, AllCBTs tutorials, JSS3 mathematics.