You Are Trying to Analyze a Risk-Reward Profile of an Investment

You are trying to analyze a risk-reward profile of an investment. There are two random variables of interest:
the price per unit (P) and the demand per unit (D). Then Profit (z) function is related to by the following
expression where the profit margin is known to be 0.6. Given the following information, calculate the mean and
standard deviation of this profit function.