Question

The mean age of 25 students in a class is 12 .if the teacher s age is included , the mean age increase by 1 .The teacher s age (in years ) is

(1) 24 (2) 38 (3) 30 (4) 48​

Answer 1

Answer:

Hey there!

We use,

Mean = Sum of observations / Number of observations

Number of students = 25

Mean age = 12

Sum of ages = 25 * 12 = 300 .

Now, If one more person is added the mean increases by 1 .

So, New mean = 13 .

Sum of ages = 13 * 26 = 338 .

Teacher age = 338 - 300 = 38

Answer 2

Answer:

38 is answer

Step-by-step explanation:

We use,

Mean = Sum of observations / Number of observations

Number of students = 25

Mean age = 12

Sum of ages = 25 * 12 = 300 .

Now, If one more person is added the mean increases by 1 .

So, New mean = 13 .

Sum of ages = 13 * 26 = 338 .

Teacher age = 338 - 300 = 38