Bill has some counter in a bag. 3 of the counters are red
7 of the counters are blue
the rest of the countes are yellow
Bill takes at random a counter from the bag
The probability that he takes a yellow counter is 2/7
(b) How many yellow counters are in the bag before Bill takes a counter

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?