In a shop a the cost of 4 shirts and 4 pair of trousers and 2 hats is $660. the cost of 9 shirts and 9 pair of trousers and 6 hats is $1,399 what’s the cost of 1 shirts and 1 pair of trousers

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?