Your boss has asked you to analyze and report on your division's sales for the first nine months of this year. Using the following data from company invoices, calculate the mean for each quarter and all averages for the year to date. Then identify and discuss the quarterly sales trends.

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January $24,600 April $21,200 July $29,900 February 25,900 May 24,600 August 30,500 March 23,000 June 26,800 September 26,600