Arithmetic Mean

If the mean of $n$ observations is $5$ and sum of observations is $25$, then find $n$.

If the mean of observations $14, 5, 4, 8, 2, 3, x$ is $x$, then find the value of $x$.

The mean of 4 numbers is 6 and the mean of other 6 numbers is 9. Find the mean of all the numbers.

If the data $7, 8, k, 11, 15$is in ascending order and median is 10, then find the value of k.
 

 Find the mean of the given data .

The mean height of a group of $30$ students is $150 \mathrm{cm}$. If a $150 \mathrm{cm}$ tall students is included in the group, then find the mean height of the new group.

The marks obtained by $15$ students in an examination are given below: $40, 20, 24, 19, 20, 35, 12, 48, 29, 40, 45, 48, 42, 23, 35$.

Find the average marks of the students.
 

Find the mean of first five prime numbers.

If the mean of $2, 3, x, 7, 8$ is $x$ then find the value of $x$

If the mean of 4, x and y is 6, then find the mean of x, y and 10.

Find the mean of $4, 6, 7, 9, 4$.

In a class, there are $20$ girls and $30$ boys. The mean weight of $20$ girls is $35 \mathrm{kg}$ and mean weight of $30$ boys is $60 \mathrm{kg}$. Find the mean weight of the class.

The average of five numbers is $35$. If mean of three of these numbers is $37$, what is the mean of the other two numbers?

Find the arithmetic mean between $-5 \& 5$.

Average of the marks in maths of 40 students in a class was 74. The mean of marks for boys was 72, while their number was 21. The mean of marks of girls in the class was

The mean of $11$ numbers is $7$. If each number is multiplied by $6$, then the mean of new set of numbers is

Khilona earned scores of $97, 73$ and $88$ respectively in her first three examinations. If she scored $80$ in the fourth examination, then her average score will be

 A batsman scores 80 runs in his 6th inning and thus increases his average by 5. What is his average after 6th inning?

In the data given below, the observation p is missing $2.5, 1.5, p, 1.7, 2.5, 1.3, 3.5$ If the mean is 2.5, then the missing observation p will be

A person made 165 telephone calls in the month of May in a year. It was Friday on 1st May of the year. The average of telephone calls made on Sundays of the month was 7. What was the average of the telephone calls per day on the rest days of the month?