The mean age of 20 students is 15 years.if the age of teacher is included then mean age is become 17 years. Find the age of teacher
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Mean age of 20 students=15
their total age will be =20x15=300
if teacher get add in them =20+1=21
their mean age=17
so 17=300+x/21
17x21=300+x
357=300+x
x=357-300
x=57
The present age of the teacher is 57
their total age will be =20x15=300
if teacher get add in them =20+1=21
their mean age=17
so 17=300+x/21
17x21=300+x
357=300+x
x=357-300
x=57
The present age of the teacher is 57
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