GCSE Secondary Maths Age 13-17 - Probability & Statistics: Cumulative frequency - Explained

The video tutorial covers cumulative frequency, starting with an introduction to frequency tables. It guides students through constructing a frequency table and plotting a cumulative frequency graph. The tutorial emphasizes avoiding common mistakes, such as plotting mid-values instead of end-values. It concludes with an analysis of a claim about parcel weights, demonstrating how to calculate percentages and verify claims using the graph.

What is the cumulative frequency of parcels weighing between 0 and 3 kilograms?

• 63

• 51

• 73

• 36

When plotting cumulative frequency, which value should be used?

• The mid value

• The start value

• The average value

• The end value

What is the difference between a cumulative frequency polygon and a curve?

• A polygon uses straight lines, a curve uses curves

• Both use curves

• Both use straight lines

• A polygon uses curves, a curve uses straight lines

How many parcels weigh less than 3.4 kilograms according to the graph?

• 73

• 63

• 56

• 51

What percentage of parcels weigh less than 3.4 kilograms?

• 80%

• 65%

• 70%

• 75%

What is the total number of parcels considered in the frequency table?

• 63

• 56

• 73

• 80

Why is Sue's claim about the parcel weights incorrect?

• She used the wrong total number of parcels

• She plotted the graph incorrectly

• She calculated the percentage incorrectly

• She used the mid value instead of the end value