Sally’s parents deposited $15000 into a collage savings on her third birthday. The account had an interest rate of 9.6% compounded annually .They were hoping that the money would double twice by the time she was 18 years old .Using the rule of 72,t=72/r ,will their hopes come true ?

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?