Question

In an art class of 6 students, the mean age is 21 years.
When a new student joins the class, the new mean is 23. What is the age of the 7th student?

Answer 1

Respuesta:

the original mean age (average age}

sumTotalAges/6 = 21

sumTotalAges = 126

When the new student came this happened:

sumTotalAgesNew/7 = 23

sumTotalAgesNew = 161

You can discover the new student's age using the difference between the orginal average and the new average:

161 - 126 = 35