Using the method of simple averages find the seasonal indices for the following data : Month Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Year 1996 15 16 18 18 23 23 20 28 29 33 33 38 1997 23 22 28 27 31 28 22 28 32 37 34 44 1998 25 25 35 36 36 30 30 34 38 47 41 53

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