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URGENT QUESTION! No time left please guys ..

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hols:
Physics May/June 2009 paper 3B
Section B, Question 6

It says (for the people who dont have it):

An engineer carried out an investigation to determine the Young modulus of a sample of a material.

(b) The engineer obtained three sets of data. The values for the Young modulus were 14.2, 14.7 and 15.1 GPa.

Determine the average value and state its uncertainty.
-----

The average value is 14.7, but what's the uncertainty ? And please elaborate how did you calculate it?

T.Q:
range /2

(max value - min value)/2

(15.1-14.2)/2=0.45

and the uncertainty always take it to one significant figure

so uncertainty = +-0.5 

abuelzouz:
wt about last hour revision?

Q80BOY:
don't do last hour revision .. chill out .. grab a bite .. head to the exam refreshed and relaxed ;)

best of luck!!  :)

hols:
Thank you so much ! +rep

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