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Statistics P6 : post your doubts here!

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hey guys.. help please.. 9709_s11_qp_61... question 5
the mark scheme says that we're supposed to get 1.272, but im getting the negative of that... -1.272.
 
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Sorry im quie confused here, arent all the houses in style A the same???

Also, what are the Conditions for a situation to be modelled be a normal distribution?

Thanks
For a situation to be modeled as a normal distribution, do you mean by questions that asks you to use 'approximation' or using the mean = np // variance = npq thing?
If I'm not wrong, the condition is np > 5, nq > 5. therefore you can use normal distribution.
 
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