Computer Networking
The difference between a multiplexer and a statistical multiplexer is

Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
Statistical multiplexers need buffers while multiplexers do not need buffers
None of these
Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

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Computer Networking
MAC is

a method of determining which device has access to the transmission medium at any time
a method access control technique or multiple-access transmission media
a very common bit-oriented data link protocol issued to ISO.
network access standard for connecting stations to a circuit-switched network
None of these

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