Essay
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 the 
chart.
b.Should the engineer be worried? Comment on any trend in the proportion of tubeless tires that will not hold air.
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