1
Question
The mean of five number is 18. On excluding one number,the mean becomes 16. find the excluded number .
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Solution
Mean of five no. Is 18
a,b,c,d,e be the five no.
(a+b+c+d+e)÷5=18 ...equation(1)
a+b+c+d+e=18×5=90
May the excluded number be 'e'.
Given that
(a+b+c+d)÷4=16
a+b+c+d=64 ....equation(2)
Eq(1)-Eq(2)=90-64=26
The excluded number 'e' is 26
a,b,c,d,e be the five no.
(a+b+c+d+e)÷5=18 ...equation(1)
a+b+c+d+e=18×5=90
May the excluded number be 'e'.
Given that
(a+b+c+d)÷4=16
a+b+c+d=64 ....equation(2)
Eq(1)-Eq(2)=90-64=26
The excluded number 'e' is 26
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