# versions without using built in max & min functions
maximum = 0
for things in range(len(readings)):
    if readings[things] >= int(maximum):
        maximum = readings[things]
print(maximum)

minimum = 50
for things in range(len(readings)):
    if readings[things] <= int(minimum):
        minimum = readings[things]
print(minimum)

total = 0
for things in range(len(readings)):
    total = total + readings[things]
print(total/len(readings))