If line a is a perpendicular bisector of mn, then which of the following statements is not true?

line a and mn intersect at a right angle.
line a splits mn into two congruent segments.
mn splits line a into two congruent segments.
line a intersects mn at the endpoint of mn.

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.