Question

I just have a quick question on measuring, please look at the attached pic :)

Answer 1

Does my supposed to have two digits after the decimal since the last digit is the approximation?

Answer 2

*my answer

Answer 3

:(

Answer 4

i agree. i think it's right. let me explain...

Answer 5

okay!

Answer 6

process of elimination, briefly:

7, 7.7 and 7.8 are too imprecise.

7.755 is too precise because it implies our eye could visually divide the space between two markings into a hundred intervals, which is impossible for most people.

so it has to be 7.77 in my opinion.