The postmaster of a small western town receives a certain number of complaints each day about mail delivery. day1 2 3 4 5 6 7 8 9 10 11 12 13 14 number of complaints 4 12 16 8 9 6 5 12 15 7 6 4 2 11a. determine three-sigma control limits using the above data. (round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. leave no cells blank - be certain to enter "0" wherever required. round up any negative control limit value to zero.) ucl lcl b. is the process in control? yesno

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit