- #1

- 106

- 0

149.6

150.9

149.7

147.9

147.7

152.4

149.8

152.2

153.2

148.9

They were taken on an optical bench where the smallest unit of measurement was 1mm. I'm trying to calculate the +- error but I'm not sure how to. I've came across 3 methods so far,

1. Standard deviation

2. [itex]\frac{max - min}{average}[/itex][itex]*100 *0.5[/itex]

3. [itex]\frac{max - min}{no.values}[/itex]

2. [itex]\frac{max - min}{average}[/itex][itex]*100 *0.5[/itex]

3. [itex]\frac{max - min}{no.values}[/itex]

Which should I use? Also, since the smallest unit of measurement was 1mm, should I round each of my readings to the nearest mm?