refactor: module organization

src/main.py

@@ -1,20 +1,13 @@
 from sympy import diff, limit, oo, symbols
 import unittest
 
-from modules.math import (
-	test_math_module
+from modules.essential_math.examples.statistics_example import (
+	normal_distribution_example,
+	basic_statistic_concepts_example,
+	z_scores_example,
 )
-from modules.probability import (
-	test_probability_module
-)
-from modules.statistics import (
-	test_statistics_module
-)
-from modules.strings import t_strings
 
 if __name__=="__main__":
-	# t_strings()
-	# test_math_module()
-	# test_probability_module()
-	test_statistics_module()
-	# test_exercises_module()
+	# basic_statistic_concepts_example()
+	# normal_distribution_example()
+	# z_scores_example()