Biology % uncertainty
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.
Include the percentage error (uncertainty) of surface area in your answer. Show your working. [3 marks]
ive got the area (9.85mm^2) but i dont understand how to get the % uncertainty (the answer is 18.5-19)
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.
Include the percentage error (uncertainty) of surface area in your answer. Show your working. [3 marks]
ive got the area (9.85mm^2) but i dont understand how to get the % uncertainty (the answer is 18.5-19)
Reply 2
If like to know too bump
Reply 5
Original post by maheenxox
(uncertainty/value)*100 {You do this for both the width and the length then add them together 
thanks
Reply 6
https://www.youtube.com/watch?v=e9usolzPuQw This video really helped me and it have how to get that answer when you put the numbers in
Reply 7
Original post by kate1234567
https://www.youtube.com/watch?v=e9usolzPuQw This video really helped me and it have how to get that answer when you put the numbers in
thank you so much, that's so helpful
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