Arandom sampling of a company's monthly operating expenses for n=36 months produced a sample mean of $5474 and a stan-dard deviation of s 764. find a 90% upper confidence bound for the company's mean monthly expenses.

Answer with explanation:

Mean of the sample(m) = $ 5474

Standard deviation of the sample (S)=764

Number of observation(n)=36

So, Mean Monthly Expenses of Population =$ 5405.76, which is 90% upper confidence bound for the company's mean monthly expenses.

a 10 percent increase