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

23%

allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.)

	Performance		Observation (seconds)
Element	Rating		1		2		3		4		5
Grasp and place bag	115	%	9		9		8		10		6
Fill bag	80	%	36		40		40		34		110	*
Seal bag	105	%	15		16		12		21		19
Place bag on conveyor	85	%	8		6		8		29	^	34	^

* Bag breaks open; included as delay in the allowance factor

^ Conveyor jams; included as delay in the allowance factor

Part 2

a) The standard time for this process = 82.2482.24 seconds (round your response to two decimal places).

Part 3

b) The number of observations that are required for a 95% confidence level within 5% accuracy = ___ enter your response here observations (round your response up to the next whole number).