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The mean age for a person getting married for the first time is 27.3 years. Assume...

The mean age for a person getting married for the first time is 27.3 years. Assume the ages for first marriages are normal with a standard deviation of 4.9 years. (Give probability answers to four decimal places.)

a) What is the probability that a person being married for the first time is between 23.6 and 31.7 years old?

b) What is the probability that a person being married for the first time is over 33.1 years old?

c) What is the probability that a person being married for the first time is between 25.4 and 33.8 years old?

d) 75% of people getting married for the first time do so before what age?

Math   Statistics-And-Probability   
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If there is any understanding problem regarding the sum, please feel free to ask any doubt in comment box. THANKS.

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