Will mark brainliest and give 11 points if you give explanation

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?

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

An object in geometry with no width, length or height is a(n):