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A salesperson created a 99% confidence interval of (279.91, 500.28) megabytes per month to estimate the average capacity usage of an iPhone.What is the value

A salesperson created a 99% confidence interval of (279.91, 500.28) megabytes per month to estimate the average capacity usage of an iPhone.What is the value of the width of this confidence interval?Please give your answer correctly rounded to two decimal places

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