Conclude that you made a mistake in the way you collected the data
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You probably mean "average"- the "middle" or "expected" value of a data set.
I've included a couple of links. Statistical theory can never tell you how many samples you must take, all it can tell you the expected error that your sample should have given the variability of the data. Worked in reverse, you provide an expected error and the variability of the data, and statistical theory can tell you the corresponding sample size. The calculation methodology is given on the related links.
Different types of graphs are appropriate for different types of data.
Charts show the data by depicting quantities of different times or different groups altogether
The two are very different....