Question: A telephone network substation will keep trying to connect a long - distance call to a trunk line until the fourth attempt has been made.

A telephone network substation will keep trying to connect a long

-

distance call to a trunk line until the fourth attempt has been made. After the fourth unsuccessful attempt, the call number goes into a buffer memory bank, and the caller gets recorded message to be patient. During peak calling periods, the probability of a call connecting into trunk line is

65 %

on each try.

)

What is the probability that a call made during peak times will connect into a trunk line on the first attempt?

)

What is the probability that a call made during peak times will connect into a trunk line only on the second attempt?

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