Whats the anserr becuse i got this wrong on a home work sheet

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

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?