Quadrilateral PQRS has vertices P(- 3, - 4), Q(9, 5), R(- 1, 10) , and S(- 5, 7) . Prove that quadrilateral PQRS is an isosceles trapezoid. (show work pls)

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?