A study looked at the running times of certain movies released in 2005, as shown to the right. The standard deviation of these running times is 18.4 minutes, and the quartiles are Upper Q 1 equals99 minutes and Upper Q 3 equals118 minutes. a) Describe the spread in running times based on i) the quartiles. ii) the standard deviation. b) Should there be any concerns about using either of these descriptions of spread? Explain.

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