Reading 13例题:Bond indexes and the challenges of matching index.
第一问:Interpret tracking error target for the fixed-income fund.
回答:The target tracking error of 1.25% means that assuming normally distributed returns, in 68% of time periods, the Fund should have a return that is within 1.25% of the ALBI.
问题:68%是1倍标准差对应的概率,但是全文没看到1倍标准的信息。请问是怎么得来的?