算术平均数;
The middle price is the arithmetical average of the bid price and ask price.
中间价是买入价和卖出价的算术平均数.
It is demonstrated that the "validity" criterion of the theory of estimation in mathematical statistics ( named classic estimate later) isn't right and arithmetical average value x isn't the best estimate.
论证了数理统计中估计理论(以下称经典估计)的有效性准则不成立,算术平均值x不是最优估计量;
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