perform a perth analysis for all level activities in the road project construction of 50 km , calculate the following;

-OPTIMISTIC TIME

-MOST LIKELY TIME

-PESSIMISTIC TIME

-EXPECTED ACTIVITY TIME

-STANDARD DEVIATION

-VARIANCE

-FOR ONE OF DATE A HEAD OF MOSTLIKELY COMPLETIONDATE, CALCULATE Z AND HENCE THE PROBABILITY OF COMPLETION BY THAT DATE

-FOR ONE DATE BEHIND,THE MOST LIKELY COMPLETION ON DATE, CALCULATEZ AND HENCE THE PROBABILITY OF COMPLETION BY THAT DATE