imtired.
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https://filestore.aqa.org.uk/sample-...3-QP-JUN18.PDF

Question 4.2

I worked out the volume by doing the area of the square x the depth = 0.00025

And I don't know what to do next. Thank you
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TheVirtualPhoton
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You are right in that the volume of the sample is 0.00025mm^3, giving you a mean of 7 cells/0.00025mm^3.
Since this has been diluted, you next need to find what this would be in the original sample. So if you have 7 cells/0.00025mm^3 in a sample that has been diluted 200 times, what would your original sample be?
This will give you your answer which you need to convert to standard form.
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