Question: A : 30% B:70% expected return: A: 9% B: 13% standard deviation: A: 8%, B: 48% the whole expected return: 11,8% how to calculate the

A : 30%

B:70%

expected return: A: 9%

B: 13%

standard deviation: A: 8%, B: 48%

the whole expected return: 11,8%

how to calculate the whole standard deviation?

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