Alexa wanted to grow out her hair. She measured the growth each month. The first month her hair grew 1.775 centimeters. The next month it grew 1.45 centimeters. The third month it grew 1.2 centimeters. How many centimeters did her hair grow in the three months? (please also show how you did it!)

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?