SAT2物理提问A science teacher measures the length of her car to

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SAT2物理提问
A science teacher measures the length of her car to be 3.46 m. What is the margin of error in her measurement?

(A) ± 0.001 m
(B) ± 0.005 m
(C) ± 0.01 m
(D) ± 0.05 m
(E) ± 0.06 m

C is not the correct answer. You should have selected D.
Explanation
When reporting a measurement, the last digit is always uncertain, and can be off by as much as one-half the value of the second to last digit. In this case, the science teacher guessed the final 6, meaning that her car could really have a length anywhere between 3.41 m and 3.51 m.
谁能解释一下为什么?谢谢

答案上写因为最后一位是估读的,所以应该在3.41-3.51之间,也就是说答案它认为呢,这个最后一位相当是测不准的,所以误差在0.1米左右,这个是哪本上面的题目?不会是巴朗吧= =我还没有做呢
再问：不是巴郎，是我在网上看到的，突然一惊，发现不会……我还是没懂啊……
再答：总之答案的意思是最后一位测不准，所以相当于最后一位作废，那么最接近的答案就是+-0.05m

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