Two brothers leave from the same point driving in opposite​ directions, the first brother driving at 60 miles per hour and the second at 65 mph. The first brother has a​ one-hour head start. If each brother has a communication device that allows him to talk to the other for up to a 200​-mile ​range, how long will they be able to talk to each​ other?

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?