diff --git a/zad1/main.py b/zad1/main.py
index 520f3d9..ad366ae 100644
--- a/zad1/main.py
+++ b/zad1/main.py
@@ -3,7 +3,6 @@ Komputerowa analiza danych
 Zadanie 1
 Michał Leśniak 195642
 """
-import math
 import locale
 locale.setlocale(locale.LC_ALL, '')
 
@@ -26,7 +25,8 @@ def mean(lst):
     return sum/len(lst)
 
 
-def median(lst, is_even):
+def median(lst):
+    is_even = len(lst) % 2 == 0
     return (lst[len(lst)//2-1]+lst[len(lst)//2])/2 if is_even else lst[len(lst)//2]
 
 
@@ -34,25 +34,27 @@ def sample_standard_deviation(lst, lst_mean):
     sum = 0
     for x in [(y-lst_mean)**2 for y in lst]:
         sum += x
-    return math.sqrt(sum/(len(lst)-1))
+    return (sum/(len(lst)-1))**0.5
 
 
-def q1(lst, is_even, lst_median):
-    idx = len(lst)//2-1 if is_even else len(lst)//2+1
+def q1(lst, lst_median):
+    is_even = len(lst) % 2 == 0
+    idx = len(lst)//2 if is_even else len(lst)//2+1
     sorted_list = lst[:idx]
     if is_even:
         sorted_list.append(lst_median)
 
-    return median(sorted_list, is_even)
+    return median(sorted_list)
 
-
-def q3(lst, is_even, lst_median):
+#
+def q3(lst, lst_median):
+    is_even = len(lst) % 2 == 0
     idx = len(lst)//2+1 if is_even else len(lst)//2
     sorted_list = lst[idx:]
     if is_even:
         sorted_list.insert(0, lst_median)
 
-    return median(sorted_list, is_even)
+    return median(sorted_list)
 
 
 def min(lst):
@@ -64,10 +66,10 @@ def max(lst):
 
 
 def calc_data(lst):
-    is_even = len(lst) % 2 == 0
     lst_mean = mean(lst)
-    lst_median = median(lst, is_even)
-    return min(lst), lst_mean, sample_standard_deviation(lst, lst_mean), lst_median, q1(lst, is_even, lst_median), q3(lst, is_even, lst_median), max(lst)
+    lst_median = median(lst)
+    return min(lst), lst_mean, sample_standard_deviation(lst, lst_mean), lst_median, \
+        q1(lst, lst_median), q3(lst, lst_median), max(lst)
 
 
 def calc_species_data(species):
@@ -184,6 +186,7 @@ def main():
         petal_width_list.append(float(petal_width))
         species_dict[species] += 1
 
+
     sepal_length_list.sort()
     sepal_width_list.sort()
     petal_length_list.sort()