We have in our system a 20MW remote load that is served by a single 100 miles line with the following reliability data: Failure Rate 0.07 outages / year per mile with a duration of 8 hours. We also know that there are 0.2 outages per years terminal related ( 0.1 each) with a duration of 10 hours. What is the expected frequency of the line failing (approximate calculations can be used)
a. 7.2 times /yr.
b. 5 times /yr.
c. 8 times /yr.
d. 0.09 times /yr.