Question

The average age of a class of 23 students is 19 years. After a week, 7 students, whose average age is 21 years, joined the class. Later, 3 students, whose
average age is 18 years, moved to another class. What is the current average age of the class?
19.6 years
18.5 years
20.1 years
20.6 years

Answer 1

Answer:

19.6 year

Step-by-step explanation:

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Answer 2

The average age of the current class is equals to option (A) 19.6

Step-by-step explanation:

In this question we first need to understand how to calculate the average value.

The average value is defined as the sum of all the data values divided by the total no. of data values.

i.e. If Navg denote the average value of of N no. of data values

then Navg = ∑x/N where ∑x denotes the sum of all data values.

Using this concept, the question has been solved in the attached images.