2 个回答

• 

  陈....

  2022-09-17

  Introduction to Statistics统计入门
  Statistical Questions，Sample or population，tpyes of data，Low or High Variability，Estimation
  MathSmart Follow Me！大量实例，图文并茂，直观易懂！每天跟我学数学，我行，你也行

• 

  静以修心丶

  2022-09-17

  Regulated, Capital-Intensive Businesses
  We have two very large businesses, BNSF and MidAmerican Energy, with important common characteristics that distinguish them from our many others. Consequently, we give them their own sector in this letter and split out their financial statistics in our GAAP balance sheet and income statement.
  A key characteristic of both companies is the huge investment they have in very long-lived, regulated assets, with these funded by large amounts of long-term debt that is not guaranteed by Berkshire. Our credit is not needed: Both businesses have earning power that, even under very adverse business conditions, amply covers their interest requirements. For example, in recessionary 2010 with BNSF’s car loadings far off peak levels, the company’s interest coverage was 6:1.
  Both companies are heavily regulated, and both will have a never-ending need to make major investments in plant and equipment. Both also need to provide efficient, customer-satisfying service to earn the respect of their communities and regulators. In return, both need to be assured that they will be allowed to earn reasonable earnings on future capital investments.
  Earlier I explained just how important railroads are to our country’s future. Rail moves 42% of America’s inter-city freight, measured by ton-miles, and BNSF moves more than any other railroad – about 28% of the industry total. A little math will tell you that more than 11% of all inter-city ton-miles of freight in the U.S. is transported by BNSF. Given the shift of population to the West, our share may well inch higher.