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Percentage error question

Can someone help me with this? I know how to do the surface area but not the percentage error

(c) A scientist measured the size of each gill lamella of the gills of 40 damselfly larvae. His results are shown in the table.



Calculate the mean surface area of one side of one gill lamella. Assume that a gill lamella is rectangular and give your answer to an appropriate number of significant figures. Include the percentage error (uncertainty) of surface area in your answer. Show your working.
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goodhat
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I've attached the information that you need I don't know how to draw a table
add the absolute uncertainties since it's in multiplication

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