book Maths Puzzle Numerical Ability

Question
In large data sets(1,000 or more values),the mean is always one of the data values. Why would this be true or false?

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book Other Question

Please help me with this graphing stuff. I don't even know how to insert a graph let alone create one with an equation. Can you give me some tips so that I could insert, create, mo Hi, I am having trouble with the following homework question:

Generate a table and a graph for y=5x-2.

Thank you for your help!