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Not sure what to do here. Social Networking Sites A recent survey of 7 social networking sites has a mean of 14.73 million visitors for

Not sure what to do here.
Social Networking Sites A recent survey of 7 social networking sites has a mean of 14.73 million visitors for a specic month. The standard deviation was 4.4 million. Find the 90% condence interval of the true mean. Assume the variable is normally distributed. Round your answers to at least two decimal places

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