we mean age of 25 students In a class is 12 if the teacher is he is included the mean is increased by 1 the teacher is in
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mean = sum of the ages of 25 stdents / 25
Here, 12 = sum / 25
Sum = 300
Now teacher's age is added, so
mean = 300+x / 26
13*26 = 300+x
x= 338-300
x= 38
Hence, the age of the teacher is 38
Hope it helps!
:)
Here, 12 = sum / 25
Sum = 300
Now teacher's age is added, so
mean = 300+x / 26
13*26 = 300+x
x= 338-300
x= 38
Hence, the age of the teacher is 38
Hope it helps!
:)
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