Blog

Guides on building histograms, choosing bins, and reading distribution shapes.

• What Two Peaks in a Histogram Mean

  Two peaks in a histogram usually mean two groups got mixed into one dataset. Learn why it happens, why the mean lies, and how to fix it.

• How to Make a Histogram in Excel (and a Faster Way)

  Step-by-step: build a histogram in Excel with the built-in chart or the Analysis ToolPak, fix the bin controls Excel hides, and when a paste-in maker is quicker.

• Frequency, Relative Frequency, and Cumulative Frequency

  Learn the three columns of a frequency distribution table with a worked ages example showing frequency, relative frequency, and cumulative frequency.

• Right-Skewed vs Left-Skewed Histograms

  Learn the difference between right-skewed and left-skewed histograms, including tail direction, peak location, and the mean vs median rule for each shape.

• How to Read a Histogram in 30 Seconds

  Read any histogram fast with a simple three step check: center, spread, then shape. Includes a quick shape table showing where the mean sits.

• How Many Bins Should a Histogram Have?

  Pick a histogram bin count with a worked example on 30 messy order counts, then compare Sturges, Freedman Diaconis, Scott, Rice, and square root.