The mean age for a person getting married for the first time is 26.1 years.  Assume the ages for first marriages are normal with a standard deviation of 4.7 years. (Give probability answers to four decimal places.)       a) What is the probability that a person being married for the first time is between 21.3 and 29.2 years old?       b) What is the probability that a person being married for the first time is over 28.6 years old?       c)  What is the probability that a person being married for the first time is between 26.5 and 33.2 years old?       d)  90% of people getting married for the first time do so before what age?

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