Solution:
Given:
A histogram showing number of strings against broken lights per string.
To get the number of strings between 41 and 50 broken lights, we look at the bar representing 41-50 number of broken lights on the x-axis and trace it to the number of strings on the y-axis.
This is shown below;
From the above, it can be deduced therefore that the number of strings that had between 41 and 50 broken lights is 7.