(4) A survey organization is estimating the percent of unemployed adults among all adults in a city. According to their calculations, an approximate 95% confidence interval for this percent is (8%,10%). You can assume that the interval was calculated correctly using the methods of our class applied to a large simple random sample of adults in the city. (a) [1pt] If possible, find the percent of unemployed adults among all adults in the city. If this is not possible, explain why not. (b) [2pts] If possible, find the percent of unemployed adults among all adults in the sample. If this is not possible, explain why not. (c) [2pts] Find an approximate 99% confidence interval for the percent of unemployed adults among all adults in the city. In this problem, use (2) ~ 97.5% and (2.58) ~ 99.5%