Which expression is equivalent to −1.3+(−4.9)+(−2.6) ?

−(1.3−4.9)+(−2.6)

−1.3−(4.9+2.6)

−1.3+(4.9+2.6)

(1.3+4.9+2.6)

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?