Mean

The arithmetic mean of $100$ observations is$24, 6$is added to each of the observations and then each of them is multiplied by $2.5$. Find the new arithmetic mean_____.

The mean of $100$items was $46$. Later on it was discovered that an item $16$was misread as $61$ and another item $43$ was misread as $34$. It was also found that the number of items was $90$ and not $100$. Then what is the correct mean?

Find the mean of the following data :

Find the mean weight of packets of coffee using step deviation method:

Find the mean of the following data:

Find the mean of the following frequency distribution using step-deviation method:

Find the mean :

The symbol $\mu$ is used for representing _____ mean.

The symbol $\overline{\mathrm{X}}$ is used for representing _____ mean.

Which one of the following symbol is used to represent the population mean?

Which one of the following symbol is used to represent the sample mean?

The scores obtained by a team in kabaddi series are as follows: 
$17,2,7,27,15,5,14,8,10,24,48,10,8,7,18,28$.
Find the mean score obtained by the team. 

Find the difference between the mean and median value of the given distribution: $5,8,2,6,9,15,12,18$.

Find the mean of the distribution : $130, 90, 25, 77, 250, 100$

The mean of the three numbers is $15$. The range of this data is $8$ while the difference between the two smallest numbers is $1$. The greatest of the three numbers is:

The mean of the $5$smallest numbers from a group is $15$ while the mean of all the $13$numbers of the group taken together is $17$. What is the mean of the$8$largest numbers?

The arithmetic mean of the scores of a group of students in a test was $52$. The brightest $20\%$ of them secured a mean score of $80$ and the dullest $25\%$, a mean score of $31$. The mean score of the remaining $55\%$ is?

The mean high temperature of the first four days of a week is ${25}^{\mathrm{o}} \mathrm{C}$ whereas the mean of the last four days is $25.5^{\mathrm{o}} \mathrm{C}$. If the mean of the whole week is $25.2^{\mathrm{o}} \mathrm{C}$, then the temperature of the $4^{\mathrm{th}}$ day is:

Find the sample variance of the following given data:
$15, 20, 25, 30, 35$

If there are three observations $20$, $25$ and $30$, then find the sum of deviation of the observations from their arithmetic mean is: