Here are definitions for the key terms related to histograms: - Data set: A collection of data values. - Frequency: The number of observations (data values) that fall into a particular class interval. Calculated by counting the number of data values within the interval. - Class interval: A range of values into which individual observations are categorized. Calculated by dividing the range of the data set into equal-sized sections. - Frequency polygon: A graph that connects the midpoints of the class intervals to the corresponding frequencies using line segments. - Midpoint: The average value of the class interval. Calculated by taking the average of the lower and upper class interval boundaries. - Range: The