All I did is I counted this data set. I mean, I did this first, but you could say, how many times do I see a 0? Or I see it 1, 2, 3, 4 times. How many times do I see a 1? 1, 2, 3, 4, 5, 6, 7 times. That's what we mean by frequency. Now a histogram is really just a plot, a kind of a bar graph, plotting the frequency of each of these numbers.