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# what is the percent uncertainity implied by the numbers 1.1 and 9.9?

can someone show me how to do these kind of problms

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- Steve4PhysicsLv 79 years agoFavorite Answer
If X = 1.1 it means X should be between 1.05 and 1.14999999999999999...

Basically, the uncertainty is ± 0.05

For example:

- if X is 1.05 it would be rounded to 1.1

- if X is 1.149 it would be rounded to 1.1

but

- if X is 1.04 it would be rounded to 1.0

- if X is 1.15 it would be rounded to 1.2

The %uncertainty for 1.1 is 100 x 0.05/1.1 = 4.5%

The %uncertainty for 9.9 is 100 x 0.05/9.9 = 0.51%

- ry0534Lv 69 years ago
You are not clear. But if this is a lab class, then the percent diff between observed and actual = |observed - actual| x 100 / actual

- ManCave747Lv 69 years ago
not too sure what you are asking, but.: how about :

percent of uncertainity is: A. .9

and B. .1

hows that? good?

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