CHAPTER-14 STATISTICS (SET-2)

Questions in this test

1. If the mean of $x, x+3 ,x+5, x+7, x+10$ is 9, the mean of the last three observations is-
2. The mean value of five observations $x, x+2, x+4, x+6,$ and $x+8$ is 11, then the value of $x$ is
3. If $x$ is the mean of $x_1, x_2, x_3..........x_n,$ then $\begin{array}{l}n\\ \Sigma \ \ \ \ \left(x_i-\overline{x}\right)=?\\ i=0\end{array}$
4. If each observation of the data is increased by 5, then their mean
5. The median of the numbers: 4, 4, 5, 7, 6, 7, 7, 12, 3 is
6. Mode of the data:- 15, 17, 15, 19, 14, 18, 15, 14, 16, 15, 14, 20, 19, 14, 15 is
7. The class mark of the class 130 - 150 is
8. The mean of five numbers is 30, if one number is executed, their mean become 28, the excluded number is
9. The median of the data arranged in ascending order $8,9,12,18,(x+2),(x+4), 30,31,34,39$ is $24$ the value of $x$ is
10. The mean of 100 observations is 50 it one of the observations 50 is replaced by 150 the resulting mean will be