This is a basic question related to Smalltalk programming language. Please give the correct solution and not copied from another source or else you'll get a downvote.

Write a Smalltalk script in the playground that computes and prints the average of all the even integers in an array. You may use any loop style you like. Assume nothing about the contents of the array; It might contain any mixture of types or objects. However, only those elements that are integers, and even, should contribute to the average. Create your own heterogeneous array to test your script