[計量] If the average (arithmetic mean) ...
請問大家了
If the average (arithmetic mean) of x,y,z,5, and 7 is 8, which of the
following must be true?
(I) The median of the five numbers cannot be 5
(II) At least one of x, y and z is greater than 9
(III) The range of the five numbers is 2 or more
(A) I only
(B) II only
(C) III only
(D) I and III
(E) II and III
謝謝!
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