- 43

- 0

A a+b

B a-b

C a x b

D a/b

The answer should be b but I can't figure out why. I know that for / and x you add the percentage errors so if the error is approx 2% then each of C and D have errors of 4% of their answers ie

C 51 x 49 = 2499 and 4% is ~100

D 51/49 = 1 and 4 % is 0.04

I think that for + and - you add absolute uncertainties ie 0,02 + 0.02 = 0.04 ie

A 51 + 49 = 100 and 100 x 0.04 = 4

B 51 - 49 = 2 and 2 x 0.04 = 0.08

But that makes C the largest error.

What am I missing here? It's supposed to be multiple choice, non calculator so I'm probably overthinking it?