Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
n = 280, x = 123; 95% confidence
O 0.381 < p < 0.497
O 0.1381 < p < 0.149
O 0.181 < p <0.497
O 0.381 < p < 0.997

I'm confused on this could anyone me and show me what i need to do to solve it.

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?

Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers