Answer: histograms

AnswerCrossword Clue
histogramsHISTOGRAM, a diagram consisting of a number of rectangles or lines drawn (usu. upwards) from a base line, their heights representing frequencies of a series of values (or value-ranges) of a quantity
histogramsA diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval