please she example and answer question seven by using the same formula please make it organized

Sensitivity Analysiz cal expect ch.z E(x)=E(y)=457.5(457,500)(250)(.17)+(500)(.83)425+41.5 7. Suppose you are trying to calculate the average amount of sales you derive from your customers. You want to be 8996 sure of yourself when you present you figures to the board of directors. You also want to be within $1,850 of the answer. Now suppose your calculations are telling you that the standard deviation will be $49,000. How large must your sample size be to allow you to stay within your $1,850 allowable crror range? Assume you cannot sample a partial piece of data, so round up