Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Calculating deviation from mean in parts per thousand - Significant figures?
The question is to calculate the deviation from a mean in parts per thousand. I am having troubles with how many sig figs would this be:
[ | 0.1068 - 0.1055 | / .1068 ] x 1000
im thinking it should be 4 sig figs since both the 0.1068 and 0.1055 are 4sigfigs.
would the answer be 12.17 ppt?
2 Answers
- Dr WLv 78 years agoFavorite Answer
because you have both add/sub AND mult/div in the same equation and because the process for determining sig figs is different for those two , you have to do this in steps
| 0.1068 - 0.1055 | = 0.0013... (2 sig figs)
then..
(0.0013 / 0.1068 = 0.012... 2 sig figs !
then since that is parts per part
(0.012 parts / 1 part) x (1000 / 1000) = 12 parts / thousand parts = 12 ppt... 2 sig figs!!!