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5 points 9 A sample of 200 calls to a customer helpline during one week found that callers were kept waiting on average of 15

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5 points 9 A sample of 200 calls to a customer helpline during one week found that callers were kept waiting on average of 15 minutes with s=6. Find the length of the CI for this result if we use a 99% CI for the length of time of all customers during this period are kept waiting. 1.10343 2.6008 5.6778 2.2069 OOOOO None of the above

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