问答题What is the average (arithmetic mean) of x and y? (1) The average of x+3 and y+5 is 14. (2) The average of x,y and 16 is 12.
问答题
What is the average (arithmetic mean) of x and y? (1) The average of x+3 and y+5 is 14. (2) The average of x,y and 16 is 12.
参考解析
解析：
将两条件分别代入计算可知，x和y的平均数均为10，故本题选D项。
将两条件分别代入计算可知，x和y的平均数均为10，故本题选D项。
相关考题：
已知Lxx=∑(x－mean(x))2=400,Lyy=∑(y－mean(y))2=3000,Lxy=∑(x－mean(x))·(y－mean(y))=－1000;则相关系数r=()。注:mean(x)、mean(y)分别为x,y的均值。 A.0.925B.-0.913C.0.957D.0.913
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