Trucks in a delivery fleet travel a mean of 110 miles per day with a standard deviation of 38 miles per day. the mileage per day is distributed normally. find the probability that a truck drives between 132 and 159 miles in a day.

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?