M4: Handling data
Module 4 (M4) - Handling data - Histograms
Histograms are a way of representing data. They are like bar charts, but show frequency density instead of the frequency. They can be used to determine the distribution of data.

Module 4 (M4) - Handling data - Stratified sampling
Stratified sampling selects a sample representative of different groups. If groups are different sizes the number selected will be proportional to the number in the group.

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