Revert "Add tests to codify behavior of weighted average logic"

This reverts commit be26efbeca.

spec/models/response_rate_calculator_spec.rb

@@ -159,36 +159,6 @@ describe ResponseRateCalculator, type: :model do
         end
       end
 
-      context 'when two grades have different numbers of students' do
-        before do
-          create(:respondent, school:, academic_year:, total_students: 60, one: 40, two: 20)
-          create_list(:survey_item_response, 20, survey_item: sufficient_student_survey_item_1, academic_year:,
-                                                 school:, grade: 1) # 50%
-          create_list(:survey_item_response, 15, survey_item: sufficient_student_survey_item_2, academic_year:,
-                                                 school:, grade: 2) # 75%
-        end
-        it 'weights the average response rate by the number of students in each grade' do
-          expect(StudentResponseRateCalculator.new(subcategory:, school:,
-                                                   academic_year:).rate).to be_within(0.01).of(58.333333)
-        end
-      end
-
-      context 'when three grades have different numbers of students' do
-        before do
-          create(:respondent, school:, academic_year:, total_students: 120, one: 40, two: 20, three: 60)
-          create_list(:survey_item_response, 20, survey_item: sufficient_student_survey_item_1, academic_year:,
-                                                 school:, grade: 1) # 50%
-          create_list(:survey_item_response, 15, survey_item: sufficient_student_survey_item_2, academic_year:,
-                                                 school:, grade: 2) # 75%
-          create_list(:survey_item_response, 15, survey_item: sufficient_student_survey_item_2, academic_year:,
-                                                 school:, grade: 3) # 25%
-        end
-        it 'weights the average response rate by the number of students in each grade' do
-          expect(StudentResponseRateCalculator.new(subcategory:, school:,
-                                                   academic_year:).rate).to be_within(0.01).of(41.6666)
-        end
-      end
-
       context 'when one grade gets surveyed but another does not, the grade that does not get surveyed is not counted' do
         before do
           create(:respondent, school:, academic_year:, total_students: 20, one: 20, two: 20)