i need help with part c and d

1. Suppose the local Childhood Lead Poisoning Prevention Council in a metropolitan area In a western United State undertakes the responsibility of deten'ninlng the proporllon of homes in a certain development of 12a homes with unsafe lead levels. Because of the great expense involved in performing spectrometric testing of Interior walls. ceilings, oors, baseboards. cabinets, and other obvious lead hazards such as crib bars, as well as of exterior sldlngs, porches and porch rails. it was decided to select a sample of homes for a study. A good up-to-date frame exists for sampling purposes. This frame Is a street listing containing the address and owner of each home for each of the streets in the target area. It was decided to select a one-in-three {1-in-3} sample of homes. Let us assume that the onlvr houses with serious lead hazard problems are the 26'\