Added last two solutions of the exercises

For_Ex_3.py

+"""Calculate sum of odd and even numbers in a list in python """
+numList = [] #create an empty list for entering numbers
+evenSum = 0 #declare and initialise a variable as evenSum=0
+oddSum = 0 #declare and initialise a variable as oddSum=0
+
+num = int(input("Enter the number of list elements: "))
+
+for i in range (1, num + 1):
+    value = int(input("Please enter the value %d: " %i))
+    numList.append(value)
+    j = 0 
+
+while (j<num):
+    if(numList[j] % 2 == 0):
+        evenSum = evenSum + numList[j]
+    else:
+        oddSum = oddSum + numList[j]
+    j = j + 1
+
+print("The sum of even numbers in this list = ", evenSum)
+print("The sum of odd numbers in this list = ", oddSum)
\ No newline at end of file

For_Ex_4.py

+"""Write a program that simulates tossing a coin n times and print how many times the tails and the head appeared. """
+
+from random import randint
+
+n = int(input("Input the desired number: "))
+num_tails = 0
+num_heads = 0
+
+for i in range(n):
+    toss = randint(0, 1)
+
+    if toss == 0:
+        num_tails = num_tails + 1
+    else:
+        num_heads = num_heads + 1
+
+tails_prob = num_tails / n * 100
+heads_prob = num_heads / n * 100
+
+print("Probability of tails: ", tails_prob, "%")
+print("Probability of heads: ", heads_prob, "%")
\ No newline at end of file