72.當放射樣本的測量計數(counts)為 625 時,則變異係數(coefficient of variation)為多少%?
(A)25
(B)10
(C)4
(D)1
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統計: A(479), B(63), C(804), D(22), E(0) #3199970
統計: A(479), B(63), C(804), D(22), E(0) #3199970