How do I make random objects form in random places

I am attempting to make a game where I have 10 numbered bubbles and I want to make a random one of these bubbles spawn in a random area under the layout every 1.5 seconds. They will then have to move upwards onto the layer. I am having serious trouble finding help with this. Any help would be appreciated thank you

Well, that was kind of fun. See if you can get what you need out of this file.

Thank You shirokuma for your reply. I tried this and it would work perfectly if I was trying to make one sprite appear in a random place but instead I need a random sprite from a family to appear in a random place. Could this be worked into your code?

I wasn't certain you had access to Families. Here is a version using them.

Thank you so much. That is exactly What I wanted