A cual de las siguientes fracciones equivale el número 0.8

What is the upper quartile in the box plot?

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?

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.