SCENARIO 2-11 the Ordered Array Below Resulted from Selecting a Sample of Sample

Short Answer

SCENARIO 2-11
The ordered array below resulted from selecting a sample of 25 batches of 500 computer chips and determining how many in each batch were defective.
Defects
1 2 4 4 5 5 6 7 9 9 12 12 15
17 20 21 23 23 25 26 27 27 28 29 29
-Referring to Scenario 2-11,if a frequency distribution for the defects data is constructed,using "0 but less than 5" as the first class,the relative frequency of the "15 but less than 20" class would be_____ .