A simple forecasting method for weekly sales of flash drives used by a localcomputer dealer is to form the average of the two most recent sales figures. Suppose sales for the drives for the past 12 weeks wereWeek:    1     2     3     4      5     6      7    8    9    10    11    12Sales:   86   75   72   83  132   65  110  90  67    92    98    73 What is the estimate of the standard deviation of forecast error obtained from the data given above?

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