the mean of five numbers is 30 if one more number is included, the mean still remains 30 - Maths - Data Handling

Question

the mean of five numbers is 30 if one more number is included, the
mean still remains 30 find the included number

Shruti Tyagi · Accepted Answer

Dear student,

Let the sum of 5 numbers be XMean=sum of  termsno
 of terms⇒30=X5⇒X=150          
(1)Let a be included in the termsMean=sum of  termsno
 of terms⇒30=150+a6          from (1)⇒180=150+a⇒a=180-150⇒a=30

thus the included number be 30

Regards

the mean of five numbers is 30. if one more number is included, the mean still remains 30. find the included number