Help graph Q

Help! I don’t get how to do this the answer is anywhere between the range 7-7.25% but I got 66.7%.
I don’t know how to do this plz explain

(edited 11 months ago)

Reply 1

ghostwalker

Original post by Alevelhelp.1

Help! I don’t get how to do this the answer is anywhere between the range 7-7.25% but I got 66.7%.
I don’t know how to do this plz explain

IMO, this question is badly worded.

When they say the "percentage decrease in haemoglobin saturation", they mean the "decrease in percentage heamoglobin saturation". For the sigmoid curve this is roughly 65 - 5 = 60. Then it is required per kPa. So, change in kPa is 6-2=4, hence decrease in percentage haemoglobin saturation per kPa is 60/4 = 15 per kPa.

Now do something similar with the linear relationship.

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