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问答题
If the average (arithmetic mean ) of x, y, z, 5 and 7 is 8, which of the following must be true?
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
A.
II.
B.
III.
C.I
D.II
E.III
F.I
G.II
II.
B.
III.
C.I
D.II
E.III
F.I
G.II
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