add program (Ruby)

fizzbuz.rb

@@ -0,0 +1,60 @@
+NUM_STUDENTS = 20
+
+# 平均点の計算
+def calculate_mean(scores)
+  scores.sum.to_f / NUM_STUDENTS
+end
+
+# 標準偏差の計算
+def calculate_standard_deviation(scores, mean)
+  squared_diff = scores.map { |score| (score - mean) ** 2 }
+  Math.sqrt(squared_diff.sum / NUM_STUDENTS)
+end
+
+# 偏差値の計算
+def calculate_z_scores(scores, mean, stddev)
+  scores.map { |score| (score - mean) / stddev * 10 + 50 }
+end
+
+# 配列を降順に並べ替え
+def sort_scores_descending(scores)
+  scores.sort.reverse
+end
+
+# 理科と英語の点数
+science_scores = [65, 80, 67, 35, 58, 60, 72, 75, 68, 92, 36, 50, 25, 85, 46, 42, 78, 62, 84, 70]
+english_scores = [44, 87, 100, 63, 52, 60, 58, 73, 55, 86, 29, 56, 89, 23, 65, 84, 64, 27, 86, 84]
+
+# 平均点の計算
+science_mean = calculate_mean(science_scores)
+english_mean = calculate_mean(english_scores)
+
+# 標準偏差の計算
+science_stddev = calculate_standard_deviation(science_scores, science_mean)
+english_stddev = calculate_standard_deviation(english_scores, english_mean)
+
+# 偏差値の計算
+science_z_scores = calculate_z_scores(science_scores, science_mean, science_stddev)
+english_z_scores = calculate_z_scores(english_scores, english_mean, english_stddev)
+
+# 合計点の計算
+total_scores = science_scores.zip(english_scores).map { |science, english| science + english }
+
+# 点数の高い順に並び替え
+sorted_total_scores = sort_scores_descending(total_scores)
+
+# 結果の表示
+puts "理科 平均点: #{science_mean.round(2)}, 標準偏差: #{science_stddev.round(2)}"
+puts "英語 平均点: #{english_mean.round(2)}, 標準偏差: #{english_stddev.round(2)}"
+
+puts "\n各学生の点数と偏差値:"
+puts " 学生 | 理科 | 英語 | 合計 | 理科偏差値 | 英語偏差値"
+puts "--------------------------------------------------"
+NUM_STUDENTS.times do |i|
+  puts format("  %2d   |  %2d  |  %2d  |  %2d  |    %.2f    |    %.2f",
+              i + 1, science_scores[i], english_scores[i], total_scores[i],
+              science_z_scores[i], english_z_scores[i])
+end
+
+puts "\n点数の高い順に並べ替えた合計点:"
+puts sorted_total_scores