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答案：
A
中间值有
X是最大值，中间值为（6+8）/2=7
或者X是最小值，中间值为（5+6）/2=5.5
平均值：（4+5+6+8+10+X）/6
根据题意，
（4+5+6+8+10+X）/6 *6/7=7时，X=16，确实为最大值
（4+5+6+8+10+X）、6 * 6/7=5.5时，计算出的X不是最小值
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