One day, a pet supply store selected every 20th person on a customer list and asked each how many dogs he or she had at home. ten persons were asked in all. number of dogs at home: 2, 1, 3, 2, 2, 1, 4, 0, 1, 4 what is an estimate of the mean number of dogs in a customer’s home?

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?