a farmer has 50 lbs of apples and 110 lbs of potatoes. the market price for apples per poundis a random variable with a mean of .8 dollars and a standarddeviation of .3 dollars. for a pound of apples, the mean price is .7 dollars and standard deviation is .1 dollars. it costs him 2 dollars to bring all the apples and potatoes to the market. find the standard deviation of the net income