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Average age for a person getting married for first time is 26 years. Suppose ages for first marriages have normal distribution with standard deviation of four years.

a) Determine the probability that the person getting married for first time is younger than 23 years of age?
b) Determine the probability that the person getting married for first time is in his or her twenties?
c) 90% of people getting married for first time get married before what age?

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