The expected return portfolio one is correct. The variance one the asnwer is correct but my formula isn’t. | Cheap Nursing Papers

The expected return portfolio one is correct. The variance one the asnwer is correct but my formula isn’t.

I need help with this question. The expected return portfolio one is correct. The variance one the asnwer is correct but my formula isn’t. Could you explain what I’m doing wrong and how it should be done?

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