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These questions are three at the end of my lab report that I can make neither...

These questions are three at the end of my lab report that I can make neither heads nor tails of. I'm including all the data I have, as well as the lab report information I have. I just need an answer to put down for the report for each question, so make your best attempt at what the answer might be. Thanks. :)

These questions are three at the end of my lab rep

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