Question Text
Question 3 :
The arithinetic mean of $5, 6, 8, 9, 12, 13, 17$ is<br/>
Question 4 :
A student got marks in $5$ subjects in a monthly test is given below<br/>$2, 3, 4, 5, 6$<br/>in these obtained marks, $4$ is the
Question 6 :
The number of observations in a group is $40$. If the average of first $10$ is $4.5$ and that of the remaining $30$ is $3.5$, then the average of the whole group is:
Question 8 :
The heights (in $cm$) of $8$ girls of a class are $140, 142, 135, 133, 137, 150, 148$ and $138$ respectively. Find the mean height of these girls.<br/>
Question 9 :
If the mean of observations $x, x + 2, x + 4, x + 6$ and $x + 8$ is $11$, find the value of $x$:
Question 10 :
The average (arithmetic mean) of a particular set of seven numbers is $12$. When one of the numbers is replaced by the number $6$, the average of the set increases to $15$. What is the number that was replaced?