How do you calculate error analysis?

Question

For example; 200 +- 5%

Please explain if possible

Answer 1

Percent yield:
(actual value / theoretical value) x 100

Percent Error:
( | theoretical - actual | / theoretical) x 100
(same as 100 - % yeild)

Theo: is from stoichiometry or other math calculation
Actual: is what you actually optained in the lab - or given to you in a problem.

Answer 2

Thanks your explanation helped a lot :]

Answer 3

Your Welcome:)