​a) Define your random​ variables, and use them to express the​ farmer's net income. A. Apounds of apples​ sold, ​, B. Aprice per pound of​ apples, ​, C. Apounds of apples​ sold, ​, D. Aprice per pound of​ apples, ​, ​b) Find the mean. The mean profit is 62 dollars. ​c) Find the standard deviation of the net income. The standard deviation is nothing dollars. ​(Round to two decimal places as​ needed.) ​d) Do you need to make any assumptions in calculating the​ mean? A. ​Yes; the prices must be independent. B. ​Yes; the variables must be discrete. C. ​Yes; the prices must be dependent. D. ​No; no assumptions are made in calculating the mean. Do you need to make any assumptions in calculating the standard​ deviation? A. ​Yes; the prices must be independent. B. ​Yes; the prices must be dependent. C. ​Yes; the variables must be discrete. D. ​No; no assumptions are made in calculating the standard deviation. Click to select your answer(s).