Fifteen samples of size 10 are taken from a stable process.The average of the sample means is 32.8,and the average range of the samples is 1.5.What is the upper control limit for the R chart? Use the information contained in the attached chart. 
Definitions:
Cocaine
A powerful and addictive stimulant drug derived from the leaves of the coca plant, primarily used recreationally.
Crack
A potent form of cocaine that is smoked and known for its rapid, euphoric effects and high potential for addiction.
Amphetamines
A class of stimulant drugs that affect the nervous system and are used medically to treat conditions such as ADHD but can be addictive and are often abused.
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