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The mean age of 5 students of a class is 10 years.if one student is excluded from the class,the new mean age become 9 years.find the age of student who is

Let the age of the excluded child be x .Old mean= 10 New mean=9 Mean= sum of observation/ total observations 10= sum of observations/ 5 sum of observation= 10*5=50 new mean : Mean= sum of observation/ total observations 9=50-x/4 9*4 =50-x 36=50-x x=50-36 x=14