Mộ người đi xe máy với vận tốc 30km/giờ thì sau 3 giờ 30 phút sẽ đi hết quãng đường AB. Nếu người đó đi ô tô với vận tốc 42km/giờ thì mất bao lâu để đi quãng đường AB

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?