import random
alist = [ ]
for i in range(1, 21):
    number = random.randint(10,50)
    alist.append(number)
print(alist)
#####################################
def max_number(alist):
    data = alist[0]
    for i in alist:
        if data < i:
            data = i
    return data
print("Maximum: ", max_number(alist))
########################################
def min_number(alist):
    data = alist[0]
    for i in alist:
        if data > i:
            data = i
    return data
print("Minimum:", min_number(alist))
######################################
def mean(alist):
    data = 0
    for i in alist:
        data = data + i
    print("Data", data)
    print("Len(Alist):", len(alist))
    result = data / len(alist)
    return result
print("Mean:", mean(alist))