Let's present the data in the form of a table and find the number of married women:
Next, find the middle of the interval and multiply the middle of the interval by the number of married women.
Find the total number of values for all intervals. And in order to find the average age of marriage, we divide the total sum of the product of the middle of the intervals and the number of married women by the total amount of married women and get the age of 35 years.
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