Final answer:
A histogram is a data display tool used to illustrate frequency distributions of continuous variables, such as age or length of stay (LOS). It uses bars of equal width to represent data and the heights of the bars represent frequencies.
Step-by-step explanation:
A histogram is a type of data display tool used to illustrate frequency distributions of continuous variables, such as age or length of stay (LOS). It consists of bars of equal width drawn adjacent to each other, with the horizontal scale representing classes of quantitative data values and the vertical scale representing frequencies. The heights of the bars correspond to frequency values. Histograms are typically used for large, continuous, quantitative data sets. Frequency polygons can also be used for graphing large data sets with repeating data points. Time series graphs can help analyze large amounts of data for one variable over some time.