Screen Link:

My Code:

```
import matplotlib.pyplot as plt
houses = pd.read_table('AmesHousing_1.txt')
pop_stdev = standard_deviation(houses['SalePrice'])
from math import sqrt
def standard_deviation(array):
reference_point = sum(array) / len(array)
distances = []
for value in array:
squared_distance = (value - reference_point)**2
distances.append(squared_distance)
variance = sum(distances) / (len(distances)-1)
return sqrt(variance)
import matplotlib.pyplot as plt
st_devs = []
for i in range(5000):
sample = houses['SalePrice'].sample(10, random_state = i)
st_dev = standard_deviation(sample)
st_devs.append(st_dev)
plt.hist(st_devs)
plt.axvline(pop_stdev)
```

What I expected to happen:

Nice work! solution check

What actually happened:

Keep getting this error, but the code seems ok.

```
TypeErrorTraceback (most recent call last)
<ipython-input-1-0b221cbdffe4> in <module>()
23 st_devs = []
24
---> 25 for i in range(5000):
26 sample = houses['SalePrice'].sample(10, random_state = i)
27 st_dev = standard_deviation(sample)
<ipython-input-1-0e34e76ec935> in range(x)
4
5 def range (x):
----> 6 return max(x) - min(x)
7
8 range_by_year = {}
TypeError: 'int' object is not iterable
```

I tried to reload the page, write the code again and check line by line if something was wrong.

Thank you very much!!