The given histogram indicates the number of jars (y-axis) that have a determined number of candies (x-axis). The number of candies in each jar are ordered in class intervals.
To determine how many jars have between 1 and 10 you have to look at the height of the column of the histogram that corresponds to this interval, which is the first column.
Looking at the graph, you can determine that 9 jars have between 1 and 10 candies.