Revision Lesson from grouped data - Mean, Mode, Freq.Poly, C Freq, Box

One set of grouped data ..... can you find ...
a) an estimate of the mean
b) the modal class
c) draw a frequency polygon
d) draw a cumulative frequency graph
e) on the cf graph find the median and the LQ & UQ
f) from this draw a box plot
Additional question on making a comparison between two box plots .
A suggested answer is included for each part of the question