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21 72 21 56
153
N H
= 21, ∑ƒx H
= 72
∑ƒx H
72
X H
= = = 3.43
N H
21
N L
= 21, ∑ƒx L
= 56
∑ƒx L
56
X L
= = = 2.67
N L
21
X H
- X L
= 3.43 - 2.67 = 0.76
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