Next Bar Charts Pictograms and Tally Charts Practice Questions. The following histogram shows the number of children visiting a park at different time intervals. In order to draw a histogram to represent this data we need to find the frequency density for each group.
Read your list of numbers one at a time and for each number you read add 1 to the corresponding counter.
The area of the bar. Find frequency from a histogram. A bell-shaped histogram has a single peak. If we look at the first group we can see it has a frequency of 4 and a width of 20.