Answer require for the question


Can anybody help me please to solve this question with detail.

You are estimating the cost for the website development work package. Most likely the cost will be $1,000. However, there is a chance it can cost as much as $ 1,800 or as little as $500. What is the best estimate for work package ?

A. $1,050

B $1,100

C $1,000

D $3,300

Answer is "A", but i don’t understand how its come.

Ans should be A.

Using the formula for PERT = P+4M+O/6 = (500 + 4* 1000+ 1800)/6=1050

Thanks for update. but i am still in little bit confusion how you determine from the question that P = 500 and O = 1800.

M = 1000 its understood.

Low end of the range is pessimitic = 500, high end is optimistic 1800.

 It says Cost, therefore,

low end is Optimistic = 500  &

High end is pessimistic = 1800


Thanks for assistance, now its clear and understandable.