This Instructional Activity is a part of the Lesson 4, Unit 6, Grade 6. One student looked at the tally column and said that it looked somewhat like a bar graph turned on its side. A histogram is a graph that is like a bar graph except that the horizontal axis is a number line that is marked off in equal intervals. To make a histogram draw a horizontal line, and mark the intervals. Draw a vertical line, and label it Frequency. Mark the Frequency axis with a scale that starts at and goes up to something that is greater than the largest frequency in the frequency table.