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Given any , prove that the 'total deviation about the mean' is always zero, i. By expanding the first brackets, apply the previous result to the to...

Ive got no problems with Q's 1,4&5, but am struggling with the theory behind the others (Especially 6 & 7!), any help would be greatly appreciated!

Q1: Given any , prove that the ‘total deviation about the mean’ is always zero , i.e. . Ans: Q2: By expanding the first brackets, apply the previous result to the to prove that: . Ans:
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Q3: Prove that . (Hint: use the result of Q2) . Ans:
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