Maths by Zahfran

Cumulative frequency diagram example | Find Median, Quartiles & IQR | IGCSE Maths
In this video, I solve an example on Cumulative Frequency Diagrams step by step. This lesson will help you understand how to interpret the graph and use it to calculate important statistical measures such as:
✅ Median – the middle value of the data
✅ Lower Quartile (Q1) – the value below which 25% of data lies
✅ Upper Quartile (Q3) – the value below which 75% of data lies
✅ Interquartile Range (IQR) – a measure of data spread, calculated as Q3 – Q1
Caution ⚠️ It is not necessary that on x axis of cumulative frequency graph, always time is there.

You will also learn how to read values accurately from the cumulative frequency curve and apply them to real exam-style questions.

📌 What you’ll learn in this video:

How to plot and interpret a cumulative frequency diagram

How to find the median, Q1, and Q3 directly from the graph

How to calculate the interquartile range (IQR)

Why quartiles and IQR are important in data analysis

Common exam mistakes to avoid when working with cumulative frequency

This tutorial is especially useful for IGCSE Maths (Cambridge, Edexcel, and O Level) students preparing for exams. By the end of the video, you’ll be confident in tackling cumulative frequency problems in your past papers and scoring full marks.

✨ Don’t forget to like, share, and subscribe for more IGCSE Maths lessons and past paper solutions!



Keywords:
cumulative frequency, cumulative frequency diagram, cumulative frequency graph, cumulative frequency curve, cumulative frequency igcse, cumulative frequency gcse, cumulative frequency o level, cumulative frequency explained, cumulative frequency past paper, cumulative frequency tutorial, cumulative frequency worksheet, cumulative frequency examples, igcse maths cumulative frequency, gcse maths cumulative frequency, o level maths statistics, cumulative frequency table, cumulative frequency chart, cumulative frequency step by step, cumulative frequency class interval, statistics cumulative frequency, maths cumulative frequency graph, plot cumulative frequency, draw cumulative frequency, interpret cumulative frequency, median cumulative frequency, median from cumulative frequency, quartiles cumulative frequency, lower quartile cumulative frequency, upper quartile cumulative frequency, interquartile range cumulative frequency, IQR cumulative frequency, IQR explained, how to find IQR, IQR igcse maths, IQR gcse maths, IQR o level maths, statistics quartiles igcse, statistics quartiles gcse, data spread igcse maths, data spread gcse maths, box plot cumulative frequency, box plot from cumulative frequency, cumulative frequency practice, cumulative frequency revision, cumulative frequency exam question, cumulative frequency past paper solution, igcse maths past paper cumulative frequency, gcse maths past paper statistics, o level cumulative frequency question, igcse quartiles example, igcse statistics revision, gcse cumulative frequency curve, maths exam quartiles, maths exam IQR, statistics igcse graphs, statistics gcse graphs, igcse maths explained statistics, statistics spread of data, cumulative frequency easy method, median explained maths, quartile explained maths, IQR explained maths, IQR statistics, cumulative frequency cambridge igcse, cumulative frequency edexcel igcse, cumulative frequency ocr gcse, cumulative frequency cie maths, igcse extended maths cumulative frequency, igcse core maths cumulative frequency, how to calculate quartiles, how to calculate median, how to calculate IQR, how to solve cumulative frequency, step by step cumulative frequency, easy cumulative frequency explanation, beginner cumulative frequency, learn cumulative frequency igcse, learn cumulative frequency gcse, learn cumulative frequency o level, data handling cumulative frequency, statistics graph igcse, statistics graph gcse, statistics graph o level, frequency distribution igcse, grouped data cumulative frequency, class intervals cumulative frequency, exam style question cumulative frequency, worked example cumulative frequency, practice problems cumulative frequency, solved cumulative frequency past paper, interquartile range example igcse, interquartile range example gcse, interquartile range exam question, spread of data igcse, spread of data gcse, spread of data o level, exam revision cumulative frequency, cumulative frequency interpretation, cumulative frequency application, quartiles graph method, median graph method, IQR graph method, box and whisker plot igcse, box and whisker plot gcse, box and whisker plot cumulative frequency, igcse maths statistics tutorial, gcse maths statistics lesson, o level maths statistics lesson, igcse maths statistics practice, igcse maths data analysis, gcse maths data analysis, o level data analysis, igcse statistics topic, gcse statistics topic, o level statistics topic, igcse exam stats questions.
Source: Example taken from Savemyexams— solution by Maths by Zahfran

Reading Timetables | IGCSE & GCSE O Level Maths | Question Solved Step by Step
In this video, we solve a past paper style question on reading timetables, a common topic in the IGCSE, GCSE and O Level Mathematics syllabus. Timetable questions test your ability to read and interpret real-life data, calculate time intervals, and apply logical reasoning.

🕒 What you will learn in this video:

How to read and interpret a train timetable.

How to calculate the latest train you can catch to arrive before a given time.

How to find the total travel time between two stations.

How to work out waiting times at a station.

Tips to avoid common mistakes in timetable questions.

✨ This question is perfect exam practice because it combines data handling, time calculations, and problem-solving skills—all of which are essential for success in IGCSE, GCSE and O Level Maths exams.

📌 Exam Relevance:

IGCSE Mathematics (0580)

GCSE Mathematics (Edexcel, AQA, OCR)

O Level Mathematics (4024)

✅ Whether you’re revising for your upcoming exam or practising timetable problems for the first time, this video will help you understand the step-by-step method clearly.

🔔 Don’t forget to like, subscribe, and share if you find this helpful!


Keywords:
reading timetables igcse, igcse maths timetable questions, o level maths timetable, gcse maths timetable questions, past paper timetable question, igcse maths paper 4 timetable, igcse paper 2 timetable, o level maths data handling, gcse functional maths timetables, timetable question solved, step by step timetable maths, igcse maths past paper solutions, o level maths past paper help, gcse higher maths timetable, gcse foundation maths timetable, igcse maths 0580 timetables, o level 4024 timetable questions, exam practice timetables, timetable maths problems, maths word problems timetable, timetable interpretation igcse, timetable interpretation gcse, timetable interpretation o level, how to read a timetable igcse, understanding timetables maths, travel timetable maths, train timetable maths igcse, train timetable o level, bus timetable gcse maths, past paper question timetable maths, time duration questions igcse, waiting time maths igcse, travel time calculations maths, arrival time timetable maths, departure time maths problem, finding latest train maths, calculating waiting time gcse, maths with timetables exam practice, timetable questions solved step by step, igcse maths exam practice timetable, gcse ocr timetable questions, edexcel maths timetable, aqa gcse timetable maths, cambridge igcse maths timetable, timetable skills maths, interpreting data timetables, real life maths problems timetable, timetable questions explained, timetable revision maths, timetable problem solving igcse, timetable past paper solutions, travel timetable interpretation, how to solve timetable questions, train schedule maths igcse, solving train timetable questions, maths timetable worked examples, timetable problems with solutions, timetable exam tips, timetable tricks maths, data handling igcse timetables, everyday maths timetable, functional maths timetable problems, practical maths timetable, applied maths timetable questions, word problems timetable igcse, interpreting tables gcse maths, timetable maths practice questions, timetable question walkthrough, timetable video lesson igcse, timetable question explained gcse, timetable help o level maths, timetable question answer, timetable latest train problem, timetable duration problem maths, timetable waiting time exam, timetable journey time maths, timetable example igcse maths, timetable example gcse maths, timetable example o level maths, timetable question 0580 maths, timetable question 4024 maths, timetable igcse paper 4, timetable igcse paper 2, timetable questions edexcel, timetable questions aqa, timetable questions ocr, timetable for exams maths, timetable for real life maths, timetable practice exam, timetable question step by step solution, timetable explained slowly maths, timetable for beginners igcse, timetable calculations maths help, timetable past paper igcse, timetable past paper gcse, timetable past paper o level, timetable maths 2025 exam, timetable maths 2024 exam, timetable igcse explained, timetable easy method maths, timetable solved example igcse, timetable solved example gcse, timetable solved example o level, timetable data questions maths, timetable reading skills maths, timetable questions grade 9, timetable questions grade 10

Speed time graph | Past paper Question | Igcse math
igcse maths acceleration, igcse maths distance, igcse maths past paper solutions, igcse maths exam preparation, igcse maths tips, igcse speed time, igcse motion graphs, motion graph maths, distance speed time, speed distance time graph, physics speed-time graph, constant speed graph, acceleration graph, deceleration graph, uniform speed, non-uniform speed, motion diagram, area under graph, distance from speed-time graph, finding distance, distance travelled graph, calculate distance, distance formula, area rectangle, area triangle, area trapezium, geometry in graphs, gradient speed-time graph, acceleration from graph, deceleration from graph, slope of graph, positive gradient, negative gradient, constant acceleration, variable acceleration, acceleration formula, slowing down graph, average speed calculation, average speed formula, average speed graph, total distance, total time, mean speed, calculating average, speed over journey, exam average speed question, interpreting average speed, igcse maths past papers, cambridge igcse maths, edexcel igcse maths, o level maths motion, gcse maths graphs, ocr maths graphs, maths exam question solution, igcse revision graphs, exam technique maths, solving graph questions, difference speed-time vs distance-time, common graph mistakes, distance-time vs speed-time, confusion between graphs, avoid mistakes maths, exam tips motion, errors in graph questions, common misunderstanding maths, how not to confuse graphs, tricky graph questions, driving speed graph, car motion graph, running speed graph, cycling graph, train motion graph, bus journey graph, sports speed analysis, athletics motion, walking graph maths, travel graphs, what is speed-time graph, how to calculate distance from graph, how to calculate acceleration from graph, how to solve graph question igcse, graph maths made easy, graph problem step by step, graph question explained, graph exam solution, speed-time graph tutorial, learn speed-time graph, algebra in graphs, geometry in maths, functions and graphs, interpreting graphs, maths graph analysis, slopes and lines, maths gradient, coordinate graphs, linear graph maths, quadratic graph maths, physics speed-time graph