Mr. Pineda conducted a survey of 1020 adults, where he asked ​them, "When you​ retire, do you think you will have enough money to live comfortably or not. Of the 1020 surveyed, 510 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.

a) The Critical Value ​(Round to three decimal places​ as​ needed.)

b) Lower Bound: and Upper Bound: ​(Round to four decimal places​ as​ needed.)