Hello!
To find the closet number we first need to understand how our data, and how to find the mean.
The mean is known as the average, which we find when we add all of our data up and divide by the number of factors.
In this case, after reading our graph, our data set is equal to:
3,4,4,4,4,5,5,5,5,5,6,6,6,6,7,7,8,9,10,11
When all of these numbers are added we get = 120
120 divided by 20 (the total number of factors) is equal to 6!
Which means that the answer to this question is E. 6
Hope this helps.