What is the confidence level for the mean of monthly sales

Reference no: EM131438899

Question: The monthly sales of a mobile phone shop have been distributed with a standard deviation of $900. A statistical study of sales in the last nine months has found a confidence interval for the mean of monthly sales with extremes of $5663 and $6839.

a. What were the average sales over the nine month period?

b. What is the confidence level for this interval?

Reference no: EM131438899

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