$6.$ Averaging a$)$ Define a function average$()$ with a parameter grades that can accept an arbitrary number of integer values. This function returns the average of all values. b$)$ Define a main$()$ function to do the following: $1)$ Call the average$()$ function with the following arguments: $95,87,83,742)$ Create two random integers, x and y$.$ x is from range $-100$ to $0,$ and y is range from $0$ to $100$ inclusively. $3)$ Call the average$()$ function with x and y$.4)$ Print al the results with the average computed to two dec