Disha Expert Team Solutions for Chapter: Average, Exercise 1: Exercise

The average marks of $40$ students in an English exam is $72$. Later it is found that three marks $64, 62$ and $84$ were wrongly entered as $68, 65$ and $73$. The average after mistakes are rectified as _____.

The average of $7, 14, 21, 28........77$ is ______.

Three years ago, the average age of a family of $8$ members was $30$ years. If one child is also included in the family, the present average age of the family remained the same as three years ago. The present age of the child is _____.

The average salary of all the workers in a workshop is $₹8000$. The average salary of $7$ technicians is $₹12000$ and the average salary of the rest is $₹6000$. The total number of workers in the workshop is:

$A$ car covers $\frac{1}{5}$th of the distance $A$ to $B$ at the speed of $8 km/hr$,  $\frac{1}{10}$ of the distance at $25 km$ per hour and remaining at the speed of $20 km$ per hour. Find the average speed of the whole journey?

The average weight of $47$ balls is $4 \mathrm{gm}$. If the weight of the bag (in which the balls are kept) be included, the calculated average weight increases by $0.3 \mathrm{gm}$. What is the weight of the bag?

Brian Lara, the famous batsman, scored $6000$ runs in certain number of innings. In the next five innings he was out of form and hence, could make only a total of $90$ runs, as a result of which his average fell by $2$ runs. How many innings did he play in all, if he gets out in all the innings?

The batting average for $40$ innings of a cricketer is $50$ runs. His highest score exceeds his lowest score by $172$ runs. If these two innings are excluded, the average of the remaining $38$ innings is $48$ runs. The highest score of the player is _____.