Did not understand expectaion of mod-17:excercise 10

10) Follow these steps :
a) Go to https://developers.google.com/chart/interactive/docs/gallery/combochart
b) You need to validate the bars in chart. c) Each bar has coffee production index. d) You need to verify that index taking into consideration the complete height of the chart e) Will have to do it on ratio-proprtion basis
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Did not understand the expectation of the exercise sir.Can you please explain in a bit detail.