A diagram showing a use case diagrams for these requirements is given in the image attached.
<h3>What is system
Case diagram?</h3>
A use case diagram is known to be a kind of graphical illustration of a users in terms of their various possible association or interactions within any given system.
A use case diagram in banking can be used to prepare, depict and also to know all the functional requirements of the banking system.
Therefore, Give the use case specification for the banking system services and paying a bill online is given in the image attached.
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Answer:
the MTTF of the transceiver is 50.17
Explanation:
Given the data in the question;
failure modes = 0.1 failure per hour
system reliability = 0.85
mission time = 5 hours
Now, we know that the reliability equation for this situation is;
R(t) = [ 1 - ( 1 -
)³] 
so we substitute
R(5) = [ 1 - ( 1 -
)³]
= 0.85
[ 1 - ( 1 -
)³]
= 0.85
[ 1 - ( 0.393469 )³]
= 0.85
[ 1 - 0.06091 ]
= 0.85
0.9391
= 0.85
= 0.85 / 0.9391
= 0.90512
MTTF = 5 / -ln( 0.90512 )
MTTF = 50.17
Therefore, the MTTF of the transceiver is 50.17