Geometry inscribed angles​

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.

Could someone me with this question i’ve been stuck on it for 20 minutes

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer