3. Suppose you own two electronic stores, one in Lincoln and the other on in Omaha. You are interested in the number of laptops sold. The following table presents the bivariate probability distribution for number of laptops at the two stores. Let us dene x = number of laptops sold at Lincoln and y = number of laptops sold at Omaha. 4 Points each sub uestion (J ' _I-___ ' ' __ ' _ a. What is mean and variance of x (Please show your work).