Suppose you invest $4,500 in Stock A and $5,500 in Stock B. The variance of Stock A

Question:

Suppose you invest $4,500 in Stock A and $5,500 in Stock B. The variance of Stock A is 10%, the variance of Stock B is 20%, and the covariance between the two is 1.87%. What is the standard deviation of your (in percent)?
Stocks
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