#My python program will not run! I$\text{'}$m not sure why

import math

#You may not import any libraries other than math

def calculate$($self$)$:

return sum$($self$.$dataset$)/$ len$($self$.$dataset$)$

# Insert code to calculate and return the mean of the dataset.

class median:

def $\_\_$init$\_\_($self$,$ dataset$)$:

self.dataset $=$ dataset

def calculate$($self$)$:

sorted$\_$data $=$ sorted$($self$.$dataset$)$

n $=$ len$($sorted$\_$data$)$

if n $\%2==0$:

mid$1=$ sorted$\_$data$[$n $//2-1]$

mid$2=$ sorted$\_$data$[$n $//2]$

return $($mid$1+$ mid$2)/2$

else:

return sorted$\_$data$[$n $//2]$

# Insert code to calculate and return the median of the dataset.

class stdev:

def $\_\_$init$\_\_($self$,$ dataset$)$:

self.dataset $=$ dataset

def calculate$($self$)$:

mean$\_$value $=$ mean $($self$.$dataset$).$calculate$()$

n $=$ len$($self$.$dataset$)$

squared$\_$diff$\_$sum $=$ sum$(($x $-$ mean$)**2$ for x in self.dataset$)$

return math.sqrt$($squared$\_$diff$\_$sum $/($n $-1))$

# Insert code to calculate and return the sample standard deviation

# of the dataset.

class pstdev:

def $\_\_$init$\_\_($self$,$ dataset$)$:

self.dataset $=$ dataset

def calculate$($self$)$:

mean $=$ mean$($self$.$dataset$).$calculate$()$

n $=$ len$($self$.$dataset$)$

squared$\_$diff$\_$sum $=$ sum$(($x $-$ mean$)**2$ for x in self.dataset$)$

return math.sqrt$($squared$\_$diff$\_$sum $/$ n$)$

# Insert code to calculate and return the population standard

# deviation of the dataset.

data $=[1,2,3,4,5]$

mean$\_$calculator $=$ mean$($data$)$

median$\_$calculator $=$ median$($data$)$

stdev$\_$calculator $=$ stdev$($data$)$

pstdev$\_$calculator $=$ pstdev$($data$)$

print$("$Mean:$",$ mean$\_$calculator.calculate$())$

print$("$Median:$",$ median$\_$calculator.calculate$())$

print$("$Sample Standard Deviation:", stdev$\_$calculator.calculate$())$

print$("$Population Standard Deviation:", pstdev$\_$calculator.calculate$())$