In a rush now, but Time Div Multiplexing is when a switch is moved between different input sources on set time slices, so that each source gets a limited time to input onto a wire. Obviously this works in opposite way!
Just imagine many cables going onto one cable and then back onto many again.

Statistical multiplexing is a form of dynamic multiplexing. Dynamic multiplexing doesn't divide the resource up into fixed, pre-determined pieces, such as time-slices or frequency ranges. Instead, dynamic multiplexing allows the piece of the resource given to a particular user to vary, according to the user's individual needs, and the needs of other users.
Statistical multiplexing, a.k.a. broadcasting, is an optimistic approach to dynamic multiplexing. It simply works by allowing any user to use the channel any time it wants. Under this system users with more demanding needs will want the channel more often and, as a consequence, will get it more often.

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