Of the trees on christmas lot 50% are virginia pine, 1/10 are blue spruce, 3/20 aredouglas fir and 25% arebalsam fir. which decimal represents the ampunt of douglas fir and balsam fir trees

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?