Please answer in mathematical details with explanation, you can use Excel but plz refer to that in the spreadsheet with formulas , plz also include interpretation for the answer

1. In order to estimate the mean FICO credit score of its members, a credit union samples the scores of 95 members, and obtains a sample mean of 738.2. Assuming a population standard deviation 64.2, construct and interpret a 99% confidence interval for the mean FICO score of all of its members, to the nearest whole number
2. A survey of 21,250 households concerning telephone service gave the results shown in the following table