Amarket analyst is curious what proportion of los angeles residents have a landline telephone. a survey of 200 randomly selected los angeles residents shows that 48% percent of those selected have a landline telephone. the analyst wants to use this data to construct a one-sample z interval for a proportion. which conditions for constructing this confidence interval did their sample meet?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?