Homework Answers
The values are 3,7 and 2.
Σ2X - 2
= 2ΣX - 2
= 2 * (3 + 7 + 2) - 2
= 2 * 12 - 2
= 24 - 2
= 22.
Σ(X - 1)2
= Σ(X2 - 2X + 1)
= ΣX2 - Σ2X + Σ1
= ΣX2 - 2ΣX + Σ1
= (32 + 72 + 22) - 2(3 + 7 + 2) + 3
= (9 + 49 + 4) - 2 * 12 + 3
= 62 - 24 + 3
= 38 + 3
= 41.
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