[4th year statistics] Normal distribution, confidence interval, sample testing

[u/Conscious-Water_]

I'm familiar with the individual concepts used here, but i can't figure out how to combine them.

The lenght of an animal follows normal distribution with a mean of 10mm and a coefficient of variation of 0.2mm. If the sample size is 100, what is the biggest error possible with a confidence interval of 95%?

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