[問題] a question in SGRE
A student makes 10 one-second measurements
of the disintegration of a sample of a long-lived
radioactive isotope and obtains the following
values.
3, 0, 2, 1, 2, 4, 0, 1, 2, 5
How long should the student count to establish
the rate to an uncertainty of 1 percent?
(A) 80 s
(B) 160 s
(C) 2,000 s
(D) 5,000 s
(E) 6,400 s
這題是GRE subject的考題，我對這題完全沒有概念，
不知道從何著手。請各位幫忙一下。也希望能夠指導
我該看哪些主題，或著是看哪些書。
謝謝大家了。
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