1. There are two companies: Hamid Inc., and Hamdan Inc. Demand for each Company's product and sales depend on whether the economy is strong, normal or weak. Probabilities of each state and the sales growth are gioven below. state Probability (%) Hamdan Inc., Sales Hamid Inc., Sales growth (%) Growth (%) Strong 30 45 Normal 40 15 weak 30 -60 15 90 Is a). Calculate expected mean sales growth for Hamid Inc., and Hamdan Inc., sales growth and interpret. b). Calculate the variance and standard deviation of Hamid Inc., and Hamdan Inc., sales growth and interpret. c). Calculate the covariance between Hamid Inc., and Hamdan Inc., sales growth and interpret