Final answer:
By subtracting the age from the given year, it is determined that a person who is 28 years old in 2002 was born in 1974.
Step-by-step explanation:
To calculate the year of birth, you subtract the age of the person from the year in question. In this case, the student is 28 years old in the year 2002. We subtract 28 from 2002:
2002 - 28 = 1974.
So, if you are 28 years old in 2002, you were born in the year 1974.