this post was submitted on 20 Nov 2023
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That's a sigfig error. A fever is 38C, which is 2 significant digits. Converting to 100° F goes up an order of magnitude so you get a free sigfig, but unless the original number was 38.0C, you don't get that 0.4, you're implying precision that the original measurement never gave you.
But the fever definition wasn't that precise. They took the average temperature, 36.88 C, rounded it up to 37 C, and somewhat arbitrarily defined a fever as 1 C above the (rounded) average. Which is perfectly fine, but it means the equivalent in Fahrenheit is 100, not 100.4.