$19.$ Implement avg

Now that you have fixed the header for avg, it is time to implement the function. Again, pay close attention to the specification. When you have implemented the function, test your answer with the test script. You should pass all tests $($for now$).$

$"""$

Returns average of all of arguments $($passed via tuple expansion$)$

Remember that the average of a list of arguments is the sum of all of the elements

divided by the number of elements.

Examples:

avg$(1\mathrm{.}0,2\mathrm{.}0,3\mathrm{.}0)$ returns $2\mathrm{.}0$

avg$(1\mathrm{.}0,1\mathrm{.}0,3\mathrm{.}0,5\mathrm{.}0)$ returns $2\mathrm{.}5$

Parameter args: the function arguments

Precondition: args are all numbers $($int or float$)$

$"""$