Harrison plays a game in which he uses a net to catch balls that are randomly launched from holes in the ground. the height of one ball after t seconds is represented by the function f(t) = –16t2 + 20t. after how many seconds does the ball return to the ground? round to the hundredths place as needed. edit: answer is 1.25

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?