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M(r, s, t) denotes the average (arithmetic mean) of r, s, and t, and M (x, y) de
M(r, s, t) denotes the average (arithmetic mean) of r, s, and t, and M (x, y) de
游客
2024-01-12
21
管理
问题
M(r, s, t) denotes the average (arithmetic mean) of r, s, and t, and M (x, y) denotes the average of x and y.
Column A Column B
M (70, 80, 90) M (x, 90) where x = M (70, 80)
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
B
解析
M(r,s,t)表示r,s和t的算术平均值,M (x,y)表示x和y的算术平均值。
解:本题的正确答案为(B)。左项的算术平均值等于80,右项的算术平均值等于(150/2+90)/2=82.5
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