Question 128

If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of 21 and 3 of 22 years, the average age of the group is

Solution

It is given that 10 students are selected

and 3 were of 20 years age, 4 of 21 and 3 of 22 years

As we know that average age = $$\frac{Sum of Ages}{NumberofStudents}$$

=$$\frac{(20x3)+(21x4)+(22x3)}{10}$$

= 21 years

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