Arithmetic Mean

If we sit like this,

Average number of students sitting on each bench is _____.

The following table shows the electricity (in units) used by $25$ families of Eklara village in the month of May. How many families use $45$ units or lesser units of electricity ?

The average height of $5$ pupils in a class is $140 \mathrm{c}\mathrm{m}$. If the total height of $4$ pupils is $590 \mathrm{c}\mathrm{m}$, and the height of the fifth pupil is $h \mathrm{cm}$, find $h$.

The weights of $8$ new-born babies (in $\mathrm{k}\mathrm{g}$) in a hospital on a particular day are as follows:

$2.1, 2.7, 2.5, 3.0, 2.4, 2.9, 2.8, 3.1$

Determine the range.

Heights of $10$ students were recorded and the mean was calculated as $155.3 \mathrm{cm}.$ Later, it was found that the height of two students was wrongly copied as $163$ and $167$ instead of $133$ and $137$. Calculate the mean using correct values rounded off to $3$ decimal places.

$7$ students of $5^{\mathrm{th}}$ class scored $65, 60, 85, 70, 35, 80, 95$ in maths. Find the average of their marks.

Find the average of first $5$ even numbers.

Find the average of first $5$ odd numbers.

Find the average of first $5$ natural numbers.

Find the missing frequency (x) for the following distribution whose mean is $7.68$ :

The mean of five numbers is $27$. If one number is excluded, their mean is $25$. Find the excluded number.

The mean of the $25$ scores was found to be $64$. Later on it was discovered that two values which were $60$ and $90$ were wrongly copied as $16$ and $59$. Find the correct mean.

There are $45$ students in a class of which $15$ are girls. The mean weight of all the girls is $40 \mathrm{kg}$ and that of all the boys is $47 \mathrm{kg}$ . Find the mean weight in $\mathrm{kg}$ of the whole class rounded off to two decimal places.

Find the missing frequency $\left(x\right)$ for the following distribution whose mean is $7.68$.

The mean of $5$ observations is $15$. If the mean of first three observations is $14$ and that of the last three is $17$, find the third observation.

Find the mean of the following frequency distribution :

The mean of $5$ observation is $15$. If the mean of the first three observations is $14$ and that of the last three is $17$, find the third observation.

Find the mean of the following distribution :

Riya walked $12 \mathrm{km}$ on Sunday, $10 \mathrm{km}$ on Monday, $12 \mathrm{km}$ on Tuesday and $8 \mathrm{km}$ on Wednesday. What was her average walking in $\mathrm{km}$? 

Karin secured $89$ marks in maths, $72$ in Social Science and $95$ in Science. Find her average marks.