please explain in detail

The business college computing center wants to determine the proportion of business students who have personal computers (PC's) at home. If the proportion exceeds 30%, then the lab will scale back a proposed enlargement of its facilities. Suppose 250 business students were randomly sampled and 75 have PC's at home. Find the rejection region for this test using 0.05 level of significance. A) Reject H. if z > 1.645. B) Reject H. if z 1.96 or z