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
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol
Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the bandwidth required is different
the clocking is mixed with the data in asynchronous transmission
the pulse height is different.
None of these
the clocking is derived from the data in synchronous transmission

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