Question

the average age of 20 students in a class is 16 years. One student whose age is 18 years has litter class. find out average age of rest of the students
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Answer 1

16×19+18 divided by 20

=322/20

=16.1

hence average age = 16.1

Answer 2

Answer:

15.89 years

Explanation:

As given in question,

Total number of students = 20

The average age of total students = 16

=> Sum of total age of all students = 16 x 20

                                                   = 320

Number of student who litter the class = 1

age of student who litter the class = 18 years

now the sum of total students after 1 boy litter the class = 320 - 18

                                                                                      = 302

So, the new average age of remaining boys can be given by,

$\textrm{new average age}\ =\ \dfrac{total\ age}{\textrm{total number of studfent}}$

                                            $=\dfrac{302}{19}$

                                            = 15.89

Hence, the average of remaining student is 15.89 years.