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20 c rule

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

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?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?