Critical Thinking Questions 1. What is the sum of all frequencies in a frequency distribution? [Hint it is not 1} [1] 2. Whyr is the sum of all relative frequencies equal to 1? [1] 3. What is the relationship between percentiles and quartiles? Interpret Q1, Q2, 3; 13 as percentiles. [Hint: A number a: is at the km percentile if I: {3313. of the data in the set is less than or equal to a: .} [3] 4. What can you say about a data set when the \"box\" in the box plot is very wide but the \"whiskers\" do not go out very far from the box? [2] 5. Whyr is it important to identify outliers? [2]