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.