On average, how many bumps do most children with molluscum get?

Which one of these images is molluscum?

Molluscum can spread through contact with which of the following objects?

On average, how many children or parents reported molluscum spreading between members of a household?

This is Bump #17 (no really, that’s his name). 
Why should you try to get rid of him as soon as you can see him?