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If you mean 5 times 0 then it equals to 0
by zero line do you mean 0? or do you mean 0 with the slash in it like this /?
It is the point of origin of the x and y axes of the graph
0. The expected value of the sample mean is the population mean, so the expected value of the difference is 0.
It means 3 multiplied by 0, the answer to this is 0 because anything multiplied by 0 equals 0.