A-Level Maths: L1-04 [Data: Cumulative Frequency Curves]

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[@mikailasurya]

Thank you so much!! This was sooo helpful

[@yeahimconnor]

nice hoodie

[@harrysmith2184]

On your cumulative frequency graph, how can you be sure to plot cf=0 when x=5? Couldn't those 5 frequencies in the 5/< x < 6 be located where x=5?

[@TLMaths]

You don't know what the original data is, and so whatever conclusions you draw from this graph will only be an estimation.

[@harrysmith2184]

Also why do we use a curved graph? Wouldn't joining the points together with straight lines make more sense as there is more of an even distribution within the intervals?

[@TLMaths]

You can use a cumulative frequency polygon. The idea is that if you made the intervals very small and took the graph to its extreme, then it would be a curve. So a curve should be a more accurate reflection of the data.

[@tailsxman5254]

Does cumulative frequency graph need continuous data or or can we plot without, editing it to make it continues ,help would be appreciated.

[@TLMaths]

Yes, it needs to be continuous, otherwise it doesn't make sense to join the points up.

[@georgiaadams-newton6555]

do I need to know this for a level exams 2022?

[@TLMaths]

Are you asking whether this topic appears in the advance information?

[@tpwk9]

@Rehab Ansari Ohh hey I also do CIE but for CF graphs we always get the Upper Boundary and that's what we plot like 6.5,14.5 etc

[@ctds]

cool