an office supply store recently sold a black printer ink cartridge for $15.99 and a color ink cartridge for $23.99. at the start of a recent fall semester, a total of 40 is these cartridges was sold for a total of $734.60. how many of each type were purchased

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?