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I did not quite understand the solution. I did not complete got the second question. Such questions are too much time consuming. How can you calculate mean and median here without doing complete calculation? Do we have to write down all values, then sort them and find the median and mean?
You do not need to calculate the exact mean and median here. For the median terminal growth band SST, just visually order the black dots: since there are 20 shells, the median is around the middle two dots, which are roughly 16°C. For the average of the mean SSTs, look at the small horizontal marks: most of them are above 16°C and only a few are below it, so their average must be above 16°C. Therefore, the median terminal growth band SST is less than the average of the mean SSTs.
For alternative solutions check here:
https://gmatclub.com/forum/the-graph-sh ... 32696.html Hope it helps.