Junior Cycle · Statistics
⏱ Tested in 2 exam questions since 2022
Lesson 5 of 14
JCHL Statistics 5: Measures of Central Tendency 1 (Mean)
This tutorial is for members
Read the lesson notes free below — subscribe to watch the full worked video and download the PDF.
Subscribe for full access · €199/yrYou’ll learn
- Mean = average = add up all the values, then divide by the total number of values
- The mean uses every value (a good point)
- The mean is badly affected by outliers (a bad point) — one extreme value drags it a long way
- To find a missing value: write (sum including x) ÷ (count) = the given mean, then solve for x
Formula used
mean = (sum of all the values) ÷ (the total number of values)
Most recent exam questions
- 2025 Q4(e)
- 2022 Q2(d)
💬 Stuck on something in this lesson?
Send your question with this lesson’s name attached — you’ll get a reply by email.