period stock a  stock b           1 4.9 1.8           2 -6.2 9.6           3 -1.5 -3.8           4 2.1 -5.9           5 -5.4 6.7           6 6.8 -7.4                                                           an inventor's portfolio consists of two stocks a and b   the following  represents  each stock's rate of return (in%)  for a sample of six periods find the  covariance

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