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A sample of 5 months of sales data provided the following information. (a) Develop a point estimate of the population mean number of units sold per month. (b) Develop a point estimate of the population standard deviation. (Round your answer to two decimal places.) Orin of the qualsions on at survey asked ardults a series of quevtions on atutudes toward automation. The results showed thot 2.976 out of 4.135 responsents ase weried about a fufure in Which robots and computers can do many human jobs, 2,7%1 are worried about the development of algonthms that cae evaluate and hire job candidates; and 2,278 are wertied about the develosiment of dewerless vehides. (kound yoor answers to four itecimal pleces.) (c). Dovelop a boint entimate of the jroportion of respendents whe are woried about the develioment at driverfess vehicies