More than one quarter of the netherlands lies below sea level. lucas visits a museum located at an elevation of 7 m and bicycles to the neighborhood of purmerend which has an elevation of -16 m. which integer represents his change in elevation for the trip.

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.