Exercise: Calculate the letter grade of a series of grades Create a method get_grade that accepts an Array of test scores. Each score in the array should be between 0 and 100, where 100 is the max score. Compute the average score and return the letter grade as a String, i.e., 'A', 'B', 'C', 'D', 'E', or 'F'.

Calculate Letter Grade

def get_grade(array)
  average = (array.inject(:+) / array.size)
  if average >= 90; "A"
  elsif average >= 80; "B"
  elsif average >= 70; "C"
  elsif average >= 60; "D"
  else average >= 50; "F"
  end
end