roadtollb
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Hi guys can anyone be so kind to explain the solution bank to me...24b. It's chapter 3 from edexcel applied maths year 2.

I don't understand how come it's just 15 and not 15 - mean? and the second line of the solution, can anyone explain pls?
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mqb2766
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(Original post by roadtollb)
Hi guys can anyone be so kind to explain the solution bank to me...24b. It's chapter 3 from edexcel applied maths year 2.

I don't understand how come it's just 15 and not 15 - mean? and the second line of the solution, can anyone explain pls?
It says that
15 is the difference from the mean
So the subtraction of the mean has already been done.
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