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Maths Help

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Hey guys, I'm really struggling to make any progress on these questions; I don't even understand the hint, any help is very much appreciated!

 

Thanks

 

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a)

S(summation) (X_i - X)

= SX_i - SX (<= property of summations )

= SX_i - NX = 0 (<=no index at X, so basicly you do X + X + X... (n times), so nX)

 

b) I got no papers here, so I can't really work it out. But if you use the first hint (where you seperate), you will probably find the e^x from the second hint

 

c) can't help you here. We use other notation and I'm not sure what the matrix is.

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