URGENT QUESTION! No time left please guys ..

[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.
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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

[abuelzouz]

yea i knw but i just want 2 make sure i covered everything..

wt did u study?

[halosh92]

nov 2009
paper 1 cie physics
Q6
Q21
Q26
Q27
Q29
thxx alooot
By the way does anyone think that this paper is hard or is it just me??
:S