# Biology % uncertainty

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#1
A scientist measured the size of each gill lamella of the gills of 40 damselfly larvae.

Mean width / mm (± uncertainty / mm) 1.61 (± 0.19)
Mean length / mm (± uncertainty / mm) 6.12 (± 0.41)

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.

ive got the area (9.85mm^2) but i dont understand how to get the % uncertainty (the answer is 18.5-19)
1
2 years ago
#2
bump
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2 years ago
#3
If like to know too bump
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2 years ago
#4
(uncertainty/value)*100 {You do this for both the width and the length then add them together
1
2 years ago
#5
thanks
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#6
(Original post by maheenxox)
(uncertainty/value)*100 {You do this for both the width and the length then add them together
thanks
0
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