QUESTION 7 The annual report of a service company published that the average length of phone call of the company's customer care is 5.6 minutes with standard deviation 0.98. Fifteen calls were taken as a sample to get his result. Find a 95% confidence interval. O (4.99, 6.23) O (5.10, 6.10) (5.15, 6.05) O (5.06, 6.14)

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