The average age for a person getting married for the first time is 26 years (U. S. News and World Report, June 6, 1994). Assume the ages for first marriages have a normal distribution with a standard deviation of four years.90% of people getting married for the first time get married before what age?

90% of people getting married for the first time get married before age of 31.13.

Step-by-step explanation:

Given : The average age () for a person getting married for the first time is 26 years (U.S. News and World Report, June 6, 1994).

We assume that  the ages for first marriages have a normal distribution with a standard deviation () of 4 years.

Let x be the age before that 90% of people getting married for the first time get married.

From z-table , the value corresponds to p-value of 0.90 is 1.28155.

Formula :

Hence, 90% of people getting married for the first time get married before age of 31.13.

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step-by-step explanation:

graph them on a graphing calculator, press 2nd trace. select intersect. hit enter until it says answer. ti 84 works best

step-by-step explanation: