I need help finding part 2

The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company's policy is a 25% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) Element 1 5 9 Grasp and place bag Fill bag Seal bag Place bag on conveyor Performance Rating 110% 80% 110% 90 % Observation (seconds) 2 3 4 9 8 11 41 40 35 18 14 19 7 9 30^ 36 14 7 8 112 19 36^ Bag breaks open; included as delay in the allowance factor Conveyor jams; included as delay in the allowance factor A a) The standard time for this process = 87.57 seconds (round your response to two decimal places). observations (round your response up b) The number of observations that are required for a 99% confidence level within 5% accuracy = to the next whole number)