2 standard deviations to the left will be minus 2, and so on, and so forth.

向左 2 个标准差将为负 2，依此类推。

That right there is the standard deviation to the right, that's the standard deviation to the left.

右边是右边的标准差，左边是标准差。

So the empirical rule tells us that this middle area between 1 standard deviation to the left and 1 standard deviation to the right, that right there is 68%.

所以经验法则告诉我们，这个中间区域在左边 1 个标准差和右边 1 个标准差之间，右边有 68%。