Two plumbers charge and initial fee and an hourly rate. The equation y = 100 + 30.0 models plumber A's fee, where y is the total charge, in dollars, and x is the number of hours worked. The table shown represents plumber B's total charge for different number of hours. Plumber B Hours Total Charges (5) 105 2 그 160 2 215 Which statement about the plurnbers' charges is 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?