Instruction 2 -Referring to Instruction 2

question 109

Short Answer

Instruction 2.8
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.
$$\begin{array} { | l | l | } \hline \text { Stem } & \text { Leaves } \\\hline 9 & 147 \\\hline 10 & 02238 \\\hline 11 & 135566777 \\\hline 12 & 223489 \\\hline 13 & 02 \\\hline\end{array}$$
-Referring to Instruction 2.8,if a percentage histogram for the detergent data is constructed,using '9.0 but less than 9.9 litres' as the first class,_________% of drive-through car wash operations use less than 12 litres of detergent in a month.

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Definitions:

Average Outgoing Quality

The average quality level of products after defective items have been removed through screening or quality control procedures.

Inspection

A means of ensuring that an operation is producing at the quality level expected.

Specific Causes

Unique factors or circumstances that can lead to specific outcomes or effects, distinguished from general or common causes.

Acceptance Sampling

A statistical quality control method where a random sample of items from a lot is inspected to decide if the whole lot should be accepted or rejected.