A manufacturing process produces tubeless mountain bike tires in batches of 200.Past records show that 6% of the tires will not hold air.An engineer tests five batches,each one week apart,and shows the proportion of tires that will not hold air below.
Proportion of tires that will not hold air: 
a.Construct the centerline and the upper control limit for 
chart.
B)Should the engineer be worried? Comment on any trend in the proportion of tubeless tires that will not hold air.
Definitions:
Grossly Disorganized Behaviour
Extreme difficulty in goal-directed behavior, often manifesting as unpredictable or inappropriate actions or responses.
Dancing
The act of moving rhythmically to music, typically following a set sequence of steps, and often used as a form of expression or social interaction.
Diathesis-Stress Model
A model that recognizes the combination of a diathesis (i.e., vulnerability) and sufficient amounts of life stress that, combined, are likely to produce a disorder.
Vulnerability
The susceptibility to physical or emotional injury or attack; it can also refer to a person's increased risk of developing a disorder or illness.
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