Edit the python code below to increase efficiency.
arr = [24, 6, 15, 72, 5]
sum = 0

for i in range(5):
    if arr[i] % 2 == 0:
        sum += arr[i]
arr = [24, 6, 15, 72, 5]
sum = 0

for num in arr:
    if num % 2 == 0:
        sum += num