1) Length is measured as 9450[cm] ± 40[cm]. What is the relative uncertainty? (I

Question

1) Length is measured as 9450[cm] ± 40[cm]. What is the relative uncertainty?

(I answered .0042328042, but it was wrong?)

2)Length is measured as 9450[cm] ± 40[cm].
What is the relative uncertainty as a percentage?

(I answered +-.4232804233%, but it was wrong?)

3)Average Length is calculated from 40 measurements as 9586[cm]; but the standard deviation is =500[cm]. What is the proper way to report the average measurement?

Length = ____[cm] (Please note: we are not talking about stating the uncertainty, just the average measurement. Consider how many significant figures should be used in reporting the measurement by using the uncertainty.)

(I answered (9589±500), and it was wrong?)

Explanation / Answer

we have to consider the significant numbers

1). Answer ::  significant number 4

0 .004233

2). Answer ::  significant number 4

0.4233%

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