题目内容
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[主观题]
If the average (arithmetic mean ) of x, y, z, 5 and 7 is 8, which of the following must be
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
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