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LM3421: Why VCC output is 6.81V rather than 6.9V?

Part Number: LM3421

Hi team,

         My customer used LM3421 on their board and they test the voltage of LM3421 VCC and found the value is between 6.81V and 6.89. They tested 10 board.

We found below pic from the datasheet. We tested in environment  between 16-22°C temp. So it confuse us why Why VCC output is between 6.81V and 6.89 rather than 6.9V?

Could you have any idea?