Missouri State University
Missouri State Univ.: Introductory Statistics: Grouped Frequency Distributions
An example is provided for the explanation of grouped frequency distributions. Graphs show how to construct histograms and overlapping bell curves, and Excel documents are discussed as being useful here.
Cuemath
Cuemath: Histograms
A comprehensive guide for learning all about histograms with definitions, solved examples, and practice questions.
Math Is Fun
Math Is Fun: Histograms
Explains, with examples, what a histogram is, how it differs from a bar graph, and how to interpret one. Includes a set of practice questions.