Basic Statistics

In [13]:

    

%matplotlib inline
from collections import Counter
import matplotlib.pyplot as plt


    

In [10]:

    

num_friends = [100,49,41,40,25,3,2,5,1,4,2,5,5,5,2,5,4,555,4,1,5,2,22]
friend_counts = Counter(num_friends)
friend_counts


    

    
Out[10]:





Counter({5: 6, 2: 4, 4: 3, 1: 2, 3: 1, 100: 1, 40: 1, 41: 1, 555: 1, 49: 1, 22: 1, 25: 1})

In [20]:

    

xs = range(101)
ys = [friend_counts[x] for x in xs]
plt.bar(xs, ys)
plt.axis([0, 101, 0, 25])
plt.title('Histogram of Friend Counter')
plt.xlabel('# of friends')
plt.ylabel('# of people')
plt.show()


    

In [21]:

    

num_points = len(num_friends)
largest_value = max(num_friends)
smallest_value = min(num_friends)


    

In [22]:

    

def mean(x):
    return sum(x) / len(x)

mean(num_friends)


    

    
Out[22]:





38

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