Answer:
Probability of tractor do not start = 7.67%
Explanation:
Given data:
Probability of not start at red = 6%
Probability of not start at white = 11%
Probability of not start at Blue = 8%
Percentage of tractors produced in red line = 48%
Percentage of tractors produced in white line = 31%
hence Percentage of tractors produced in white line = 1 - 0.48 - 0.31 = 0.21
Probability of tractor do not start 
Probability of tractor do not start = 0.0288 + 0.0231 + 0.0248 = 0.0767
Probability of tractor do not start = 7.67%
The opportunity cost of college dorm living is the tuition you could have paid for with room and board fee.
<h3>How does college dorm work?</h3>
The opportunity cost of living in a university dormitory is the monthly fee that you could have paid with room and board fee, in this case the student has the alternative of being able to enjoy a college dormitory with the amount paid in the monthly accommodation fee and food, somewhere else.
Usually, the dormitory director also lives inside the building. This person can be either a graduate student or a trained student affairs professional. And unlike RA's, this figure is responsible for the entire dorm, not just one floor.
With this information, we can conclude that the opportunity cost of college dorm living is the tuition you could have paid for with room and board fee.
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