Question

The mean age of 25 students in a class is 12. If the teacher's age is included, the mean age increases by 1. The
teacher's age (in years) is
(a) 24
(b) 38
(c) 30
(d) 48​

Answer 1

Answer:

I hope it will help you...........

Answer 2

Answer:

38

Step-by-step explanation:

Sum of 25 students ages be x

⇒ Mean =

25

x

=12⇒x=300 equation - (1)

Let the teacher's age be y

⇒ New mean = 26/x+y

=13

⇒300+y=338

⇒y=38

Teacher's age =y=38

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