OG PS 218题

christina201008 · 发表于 2015-12-23 22:11:04

答案是B。求解

WilliamT · 发表于 2015-12-23 23:39:39

Assume T = (1.a, 1.b,...etc) All units equal 1.xx.
E = 40 (due to rounding of ten even and 20 odd)
S max = 30 + 10(.8) + 20(.9) = 56
S min = 30 + 10(.2) + 20(.1) = 34

E-S min = 40 - 56 = -16
E-S max = 40 - 34 = 6
Thus, the min/max of E is -16 and 6, so I , II apply.

For (III. 10) to be true, S min/max in our equation above needs to equal 30. This is impossible since the question states T consists of 30 positive decimals. Therefore eliminate III.

christina201008 · 发表于 2015-12-26 10:37:43

WilliamT 发表于 2015-12-23 23:39
Assume T = (1.a, 1.b,...etc) All units equal 1.xx.
E = 40 (due to rounding of ten even and 20 odd) ...

题目的中文意思可以告诉我一下嚒？谢谢

OG PS 218题

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