Cason function lab

[casoncalvet]

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[samuelTAIronhack]

for question 9 have a look at the following solution

`
from statistics import stdev
def st_dev(arr):

total_elements = 0
total_sum_elements = 0

for num in arr:
    total_elements +=1
    total_sum_elements += num

mean = total_sum_elements/total_elements

deviation = 0

for num in arr:
    deviation += (num-mean)**2

standard_deviation = (deviation/(total_elements-1))**0.5

return standard_deviation`