1- The total cost for a production process is equal to $600 plus two times the number of units produced. The mean and variance for the number of units produced are 800 and 500, respectively. Find the mean and variance of the total cost. The mean of the total cost is $ ? 2- Let the random variable Z follow a standard normal distribution. a) Find P(Zless than<1.161.16). b) Find P(Zgreater than>1.731.73). c) Find P(Zless thannegative 1.331.33). e) Find P(1.161.16less than