Based on the return on Rush Corporation at different phases of the economy, and that of the Oberman Corporation, the covariance between both companies is -0.079.
First find the returns on both companies:
Rush Corporation:
= (0.60 x -22%) + (0.4 x 31%)
= 0.4%
Oberman Corporation:
= (0.60 x 42%) + (0.4 x -15%)
= 19.2%
The Covariance is:
= 0.6 x (-0.22 - 0.004) x (0.42 x 0.192) + 0.4 x (0.31 - 0.004) x (-0.22 – 0.1780)
= -0.079
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