Please answer all parts completely, thank you.

While observing an administrative assistant's work, five observations were made of four common activities. The table below shows the results of these observations. Please note the aberrations to the observations and exclude them from your averages. Assume a 15% allowance factor and find the standard time for the combination of these four duties. Data entry Work Element Rating 100% Stuffing envelopes 90% Filing 110% Responding to a 115% single email Observations - minutes needed to do the job 1 2 3 4 5 Ave. Normal 4.5 4.1 4.6 5.2 4.8 3.4 3.6 3.3 9.92 3.2 7.4 7.7 8.3 7.7 7.8 2.3 2.6 11.55 2.9 2.2 a: stopped to answer the phone - disregard observation b: interrupted by supervisor - disregard observation