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Researchers have observed that regular smokers have an average life span of 68 years that is...

Researchers have observed that regular smokers have an average life span of 68 years that is normally distributed with a standard deviation of 10 years.

a) What percent of smokers will live beyond age 76? (3)

b) Matt has 2 grandparents that are smokers. What is the probability that they both live beyond age 76? (2)

Math   Statistics-And-Probability   
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