statistics

Question S) Assume that the flight time for a United Airlines flight from Philadelphia to Dallas follows the uniform probability distribution between 220 and 265 minutes. What is the standard deviation of this distribution? A) 5.05 B) 7.217 C) 10.10 D) 12.99 64.23 Question 9: Susan has been hired to visit the local shopping mall to conduct a survey about the upcoming political election. She needs to select respondents at the mall and ask them questions about their voting tendencies. Susan decides to position herself by the only entrance to the mall and select every 5th shopper entering the mall to participate. Which of the following sampling techniques best describes Susan's method? A) cluster Fl probability C) simple random D) systematic In convenience