Anna and bob are interested in the amount each uc davisstudent spent last month on food. they conducted a surveyin departments a and b. anna interviews a sample of 196students from department a and finds they spent, onaverage, $800 last month. bob interviews a sample of144 students from department b and finds they spent, onaverage $750 last month. letμaandμbbe the averageamountallstudents from departments a and b spent onfood last month, respectively.