Industrial Engineering and Production Management
Pessimistic time is

The average time required for a job
The most probable time considering all conditions
The maximum time which an activity might require
The minimum time in which an activity can possibly be accomplished

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Industrial Engineering and Production Management
Time study is carried out

All of these
By breaking up each operation into small elements which are measurable with the help of the measuring device accurately
By finding all the significant informations regarding the job, work place and machine tool etc
By observing and recording the time taken by the operator for an operation

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