Virginia College promotes a wide variety of executive-training courses for firms in the Arlington, Virginia, region. 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?

aDisregard€“€“secretary stopped to answer the phone.
bDisregard€“€“interruption by supervisor.

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Observations (minutes)Performance 123456Rating(%) Element Typing lette 25 3.5 2.8 2.1 2.6 3.3 85 Typing envelope 8 8 6 8 3.1 .7 100 Stuffing envelope 4 5 1.9 3 .6 .5 95 Sealing, sorti 10 2.9b 9 1.0 4.4b 9 125