Part1 book 1 p.68 질문입니다.

2020 FRM Part I Foundations of Risk Management

While P/F expected returns are calculated as weighted averages of individual asset returns, PF variances depend on the correlations among assets. A correlation of +1 offers no diversification benefits & results in P/F SD being a weighted average of individual variances. When corr is less than +1, diversification occurs, and p/f variance declines below the weighted average of individual variance. The lower the corr, the greater the benefit becomes. With perfect negative corr(-1), it is indeed possible to structure a p/f with zero variance.

안녕하세요,

강사님께서 variance 를 standard deviation으로 바꾸라고 하셨는데 표시된 4개 다 바꿔야하나요?

감사합니다.