def calc$\_$mean$($X$)$:

$\text{'}\text{'}\text{'}$

IMPLEMENT THIS FUNCTION.

$\text{'}\text{'}\text{'}$

return $-999$ # replace this line

def calc$\_$stdev$($X$)$:

$\text{'}\text{'}\text{'}$

IMPLEMENT THIS FUNCTION.

$\text{'}\text{'}\text{'}$

return $-999$ # replace this line

def calc$\_$cov$($X$,$ Y$)$:

$\text{'}\text{'}\text{'}$

IMPLEMENT THIS FUNCTION.

$\text{'}\text{'}\text{'}$

return $-999$ # replace this line

def calc$\_$pearson$($X$,$ Y$)$:

$\text{'}\text{'}\text{'}$

IMPLEMENT THIS FUNCTION.

$\text{'}\text{'}\text{'}$

return $-999$ # replace this line

def main$()$:

$\text{'}\text{'}\text{'}$

You can test your implementations using the function calls here.

These function calls are here only to help you test your function.

$\text{'}\text{'}\text{'}$

X $=[1\mathrm{.}5,3\mathrm{.}2,0\mathrm{.}8]$

Y $=[1\mathrm{.}9,4\mathrm{.}5,6\mathrm{.}0]$

print$(\text{'}$mean for X:$\text{'},$calc$\_$mean$($X$))$

print$(\text{'}$mean for Y:$\text{'},$calc$\_$mean$($Y$))$

print$(\text{'}$std for X:$\text{'},$calc$\_$stdev$($X$))$

print$(\text{'}$std for Y:$\text{'},$calc$\_$stdev$($Y$))$

print$(\text{'}$covariance:$\text{'},$calc$\_$cov$($X$,$Y$))$

print$(\text{'}$pearson:$\text{'},$calc$\_$pearson$($X$,$Y$))$

################################################################

$\text{'}\text{'}\text{'}$

DO NOT EDIT BELOW THIS LINE

$\text{'}\text{'}\text{'}$

main$()$