Average of 50 numbers is 38 . If two numbers, namely, 45 and 55 are discarded, average of remaining

English

Gujarati

Hindi

4.Average

medium

The average of $50$ numbers is $38 .$ If two numbers, namely, $45$ and $55$ are discarded, what is the average of the remaining numbers ?

A

$37.5$

B

$38.5$

C

$39.5$

D

$36.5$

Solution

Sum total of $50$ numbers $=50 \times 38=1900$

Sum total of the remaining $48$ numbers

$=1900-(45+55)=1800$

$\therefore$ Average $=\frac{1800}{48}=37.5$

Standard 13

Quantitative Aptitude

Share

Similar Questions

The average of $8$ numbers is $20 .$ The average of first two numbers is $15 \frac{1}{2}$ and that of next three is $21 \frac{1}{3}$. If the sixth number is less than the seventh and eighth numbers by $4$ and $7$ respectively, then the eighth number is

hard

The average weight of $A, B$ and $C$ is $84 \,kgs.$ If $D$ joins, the average weight now is $80 \,kgs$. If another person $E$ who is $3\, kgs$ heavier than $D$ replaces $A$ then the average weight of $B, C, D$ and $E$ becomes $79\, kgs.$ what is the weight of $A $ in $kg$ ?

medium

The average age of $x$ and $y$ is $20$ $years.$ If $z$ were to replace $x,$ the average would be $19$ and if $z$ were to replace $y$, the average would be $21.$ Find the ages of $x, y$ and $z$.

medium

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 $years$)

hard

The average of six numbers is $32 .$ If each of the first three numbers is increased by $2$ and each of the remaining three numbers is decreased by $4,$ then the new average is ?

medium