Consider the information below relating to the monthly rates of return for two companies X and Y over a period of 4 months:   Y   2                                                                                                         xRate of return                 yRate of Return   Date  Month 1  -4.76  -4.75  Month 2  5.34  7.65  Month 3  12.09  6.98  Month 4  -2.98  9.65     Calculate the covariance per month between the two companies. Show all your working.

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