Question: Hello, please explain your solution if possible. Thank you! The number of items coming off a production line each day is distributed normal and known

Hello, please explain your solution if possible. Thank you!

The number of items coming off a production line each day is distributed normal and known to have a standard deviation of 17.4 units per day. The production line averaged 852.3 units per day for 20 randomly selected days. What is the approximate confidence level (expressed as a coefficient instead of %) associated with the interval 844.75 to 860.0

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