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Mann-Whitney U test help? (how to rank)

I'm stuck on doing my Statistical test because I don't know what they meant by ranking?
I didn't really know which subject to file this under because I'm sure most A2 Biologists had to use statistical testing for their courseworks as well but this topic is pretty Maths-heavy so I'll be posting here instead..
It'd be easier to show a question your stuck on ? The ranking is essentially done from lowest to highest, if you have two ranks share the same value, the rank is averaged.. It'd be best explained if you have an example / question you're stuck on!

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