- Find the min and max of a number set
- Count the total of a number set
- Find the average of a number set
We have a database full of students. The schema is as follows:

learn test to get started. Write your SQL in lib/students.rb to get the specs in spec/student_spec.rb to pass.
Note: Since it's a Ruby file, write your queries as strings inside each method already defined in lib/students.rb .