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I have this last question and my teacher keeps telling me i'm doing it wrong and wont FREAKIN HELP ME PLZ:
According to Statistics Canada, a random person in Canada has
a probability of 4=5 to live to at least 70 years old and
a probability of 1=2 to live to at least 80 years old.
John (a random person in Canada) has just celebrated his 70-th birthday. What is the
probability that John will celebrate his 80-th birthday? Justify your answer.
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