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Statistics 101

Histogram – basics
More on histograms
5. Histogram of marathoners

Instruction

Histograms provide a graphical representation of a dataset. They are especially useful for larger datasets. They help you see the patterns in a dataset or help you spot any errors. Let's build a histogram of marathoners' birth years.

Do you see anything strange on this histogram? The "Year of Birth" data extends far back in time. Can a 150-year old woman run a marathon? Someone definitely made an error when entering this data! According to the dataset, Beatriz Molina (rank 567) was born in 1873! The proper year is 1973. Let's see the histogram after correcting this error.