the mean of 25 students In a class is 12. if the teacher age is included, the mean age increased by 1. the teacher is in year is
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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
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