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.
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Answered by
7
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
.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
Anonymous:
Yours? Do you want me to point out your mistake?
yes....plz
It's 4 instead of 5 in the denominator for the new mean.
thnks.
corrected........ thnk u soooooo much
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 :-)
Answered by
1
Value of deleted observation = n(mean) - (n-1)(new mean).
You get the answer as 5(10)-4(9) = 14 years.
You get the answer as 5(10)-4(9) = 14 years.
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