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astarmathsandphysics:

--- Quote from: omarsubei on May 06, 2009, 10:38:35 pm ---Hi my exam's in 12 hours, and I just don't get statistics. Please help with this question,

Consider the 10 data items x1, x2, ... x10. Given that Sum(xi)  = 1341 and the standard deviation is 6.9, find the value of the mean .

The answer is:

6.92 = 1341/10 - mean2

and then the answer works out to be +/- 9.3 .

I get the method, I just don't get why they divided by 10 ?


--- End quote ---
Did you mean Sum(xi2)?

roma:
It doesn't work

astarmathsandphysics:
what doesnt work?

haziq91:
Can anyone help me with this coursework..  I can't do q1   and question 2.....   they are quite difficult...


thanks in advance

astarmathsandphysics:
I will do it tomorrow morning.

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