从buf单元开始存放10个8位无符号数，将10个数去掉一个最大的，去掉一个最小的，将其余的数的算术平均值计算出并存在AVERG字节单元中-Start buf storage unit from 10 8-bit unsigned number, will remove a maximum of 10 numbers, removing a minimum, the rest of the arithmetic mean to calculate the number and there AVER