Letter E represents the maximum of the data set on the box-plot.
We now that in the given box-plot we have:
Letter A represents the minimum value of the data set.
Also in the given box of the whisker-box plot the lower value in the box represents the lower quartile or first quartile i.e. i.e. letter B.
Also, the middle value in the box-plot represents the middle quartile or median of the data i.e. i.e. letter C.
And the maximum value on the box represents the upper quartile i.e. i.e. letter D.
The maximum value of the data set is represented by letter E.