The time required to complete an activity under abnormal or extremely adverse conditions in which everything goes wrong is calleda)optimistic timeb)most likely timec)pessimistic timed)None of the aboveCorrect answer is option 'C'. Can you explain this answer?

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The time required to complete an activity under abnormal or extremely adverse conditions in which everything goes wrong is called

a)
optimistic time
b)
most likely time
c)
pessimistic time
d)
None of the above

Correct answer is option 'C'. Can you explain this answer?

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The time required to complete an activity under abnormal or extremely ...

Pessimistic time:

The estimate of the maximum possible time taken by activity if there is a delay at every stage except natural hazards is called pessimistic time.
It is denoted by the letter t_p.

Optimistic time:

This is to estimate the minimum possible time in which an activity can be completed in an ideal condition. In other words it the shortest time for the completion of an activity. It is denoted by to.
it does not include any type of delay or setback at any stage.

Most likely time:

The most probable estimate of time which an activity may take for its completion under normal conditions. It is denoted by t_m.
This is the time estimate usually obtained by experienced engineers.
It does include normal delay or setback which is a common thing to execute a project.

Expected time or Average time:

The average time taken by activity if it is repeated many times. It is denoted by t_e.
The average time indicates that there is a fifty-fifty chance for its completion within its time schedule.
It is determined by the following formula =

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