A business has a new computer. The service contract for the computer offers unlimited repairs for a fee of $100 a year plus a $25 service charge for each repair needed. Research suggested that during a given year 86% of these computers needed no repairs, 9% needed to be repaired once, 4% twice, 1% three times, and none required more than three repairs.
Find the expected number of repairs this kind of computer will need each year.
Can anyone help me on the above question....I think its obvious and im just missing something.