Red Deer College promotes a wide variety of executive training courses for firms in the Red Deer area. Director Marilyn Helms believes that individually typed letters add a personal touch to marketing. To prepare letters for mailing, she conducts a time study of her secretaries. On the basis of the observations shown in the following table, she wishes to develop a time standard for the whole job.

The college uses a total allowance factor of 12%. Helms decides to delete all unusual observations from the time study. What is the standard time? 

^a Disregard—secretary stopped to answer the phone.

^b Disregard—interruption by supervisor.

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Element Typing letter Typing envelope Stuffing envelope Sealing, sorting Observations (minutes) 1 2 3 4 5 6 2.5 3.5 2.8 2.1 2.6 3.3 0.8 0.8 0.6 0.8 3.1ª 0.7 0.4 0.5 1.9a 0.3 0.6 0.5 1.0 2.9 0.9 1.0 4.4 0.9 Performance Rating (%) 85 100 95 125