Monica works on a temporary basis. the mean length of each job she gets is 11 months. if the amount of time she spends between jobs is exponential with mean 3 months, then in the long run what fraction of the time does she spend working?

11/14

Step-by-step explanation:

Since the job and jobless cycles of Monica will follow an alternating renewal process,

Let

Ji=duration of i-th job period

Li=duration of i-th jobless period

E(Ji)=11 and E(Li)=3

Hence,

The fraction of the time does she spend working in long run is given by the formula =E(Ji) / (E(Ji)+E(Li))

=11/(11+3)

=11/14

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it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.