- #1

maxelcat

- 27

- 3

- Homework Statement:
- How many sig fig does the a number like 10 have?

- Relevant Equations:
- 20 has 1 sig fig

Hi. I understand that the number 20, written like this, has 1 significant figure

Suppose I took a pile of measures of length: 18, 19, 20, 21, 22, 23, 24, 25 giving a mean of 172/8 = 21.5 on my calculator

If I have to give the mean to the lowest number of significant figures then that would give an answer of 20 - which feels wrong.

I think I should work to 2 sig fig so 22 - which makes sense. So I guess my question is how how many sig fig does 20 have? Can it depend on the context?

Suppose I took a pile of measures of length: 18, 19, 20, 21, 22, 23, 24, 25 giving a mean of 172/8 = 21.5 on my calculator

If I have to give the mean to the lowest number of significant figures then that would give an answer of 20 - which feels wrong.

I think I should work to 2 sig fig so 22 - which makes sense. So I guess my question is how how many sig fig does 20 have? Can it depend on the context?