单选题
For the positive numbers, n, n+1, n+2, n+4 and n+8, the mean is how much greater than the median?
【正确答案】
B
【答案解析】[解析] 正数n, n+1, n+2, n+4和n+8和算术平均数为:
[*]
因为n, n+1, n+2, n+4和n+8都是正数,所以,n<n+1<n+2<n+4<n+8,因此其中数为n+2。由上分析可得正数n,n+1,n+2,n+4和n+8的平均数比其中数大1。