To change the default formula that is displayed, right-click the field, and then choose the formula that you want. The available formulae are: Average, count of values (COUNTA), count of numbers (COUNT), Maximum, Minimum, Sum, or None.
要修改默认显示的公式，请在该字段上单击右键，然后选择所需的公式。可用的公式包括：平均值 (AVERAGE)、值计数 (COUNTA)、数字值计数 (COUNT)、最大值 (Maximum)、最小值 (Minimum)、总计 (SUM) 或无 (None)。