What can we learn about these 77 countries?

Explore the model_coef dataframe you just created to answer the following question:

Which of the following conclusions can we make from the coefficients of our models?

50 XP

About 10% of the 77 countries had a decrease of life expectancy between 1960 and 2011.
The United States experienced the fastest growth in life expectancy.
The majority of the 77 countries experienced a growth in average life expectancy between 1960 and 2011.
All of these conclusions are correct.
None of these conclusions are correct.