Here are the data for the past 21 months for actual sales of a particular product:   LAST YEAR THIS YEAR January 300 275 February 400 375 March 425 350 April 450 425 May 400 400 June 460 350 July 400 350 August 300 275 September 375 350 October 500   November 550   December 500

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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Here are the data for the past 21 months for actual sales of a particular product:

  LAST YEAR THIS YEAR
January 300 275
February 400 375
March 425 350
April 450 425
May 400 400
June 460 350
July 400 350
August 300 275
September 375 350
October 500  
November 550  
December 500  

Develop a forecast for the fourth quarter using a three-quarter, weighted moving average. Weight the most recent quarter 0.5, the second most recent 0.25, and the third 0.25. Solve the problem using quarters, as opposed to forecasting separate months.

Note: Round your answer to 2 decimal places.

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