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Statistics 1: Post Your Doubts Here

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Q8, Paper 6683/01 Edexcel GCE Statistics S1, A/AS Friday 20 May 2011 Afternoo. I am unable to understand Part G of this question. Why compliment of 5 not 1 etc.?

outcome of even ... odd...odd which can be done in (3!/2!)=3 ways ....
0.45 x 0.2 x 0.2 x 3= 0.054
tell me if i m correct
 
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salam ..urgently need a little explanation in qustion 6 part 2
 

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Salaam Alaykum, Please help:
Esme noted the test mark, x, of 16 people in a class, she found that Σ x= 824 and that the standard deviation of x was 6.5
i) Calculate Σ (x-50) and Σ (x-50)²
ii) One person did the test earlier and her mark was 72. Calculate her new mean and standard deviation of the marks of all 17 people.


Thanks in advance Ali Railey
 
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