25 An elderly patient is a candidate for an experimental operation. The operation has a 70% chance of allowing her to live 8 more years on
average: a 20% chance of having no effect and allowing her to live 4 more years on average; and a 10% chance of making the condition worse
and allowing her to live 1 more year on average. What is the expected number of years the patient will live if she undergoes the operation?
Select the best answer from the choices provided.
A. 2.2 years
OB. 2.3 years
c. 6.4 years
D. 6.5 years
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