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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

excluded from the class.


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*4 =50-x
1 5 1
now plz mark mine as best.........plz
plz.............................r u marking.????????
ohhhhhh sry u haven't asked the question.........
but still thnks
You're welcome :-)
Value of deleted observation = n(mean) - (n-1)(new mean).
You get the answer as 5(10)-4(9) = 14 years.
0 0 0
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