Instruction 2-16
Given Below Is the Stem-And-Leaf Display Representing the Amount

Short Answer

Instruction 2-16
Given below is the stem-and-leaf display representing the amount of detergent used in litres (with leaves in 10ths of litres)in a month by 25 drive-through car wash operations in Auckland.
$$\begin{array} { l l } 9 | 147 \\10 | 02238 \\11 | 135566777 \\12 | 223489 \\13 | 02\end{array}$$
-Referring to Instruction 2-16,if a percentage histogram for the detergent data is constructed,using "9.0 but less than 9.9 litres" as the first class,the percentage of drive-through car wash operations that use "12.0 but less than 12.9 litres" of detergent would be ________.