The average marks of a student in four subjects is $75 .$ If the student obtained $80$ marks in the $5^{\text {th }}$ subject then the new average is?
$80$
$76$
$92$
$95$
Average of $a, b$ and $c$ is $11 ;$ average of $c, d$ and $e$ is $17 ;$ average of $e$ and $f$ is $22$ and average of $e$ and $c$ is $17 .$ Find out the average of $a, b,$ $c , d , e$ and $f ?$
Find the average of all the numbers between $6$ and $34$ which are divisible by $5$
Three years ago, the average age of a family of $5$ members was $17\, years.$ A baby having been born, the average age of the family is the same today. The present age of the baby is (in $years$)
The average of the squares of of first ten natural numbers is
What is the average of all numbers between $8$ and $74$ which are divisible by $7\, ?$