Statistics - Algebra - Mathematics Previous Year Questions

The variance of the following continuous frequency distribution is

If the variance of the numbers $9,15,21, \ldots,(6 n+3)$ is $P$, then the variance of the first $n$ even numbers is

The mean deviation from the median for the following data is

$$\begin{array}{cllllll} x_i & 2 & 9 & 8 & 3 & 5 & 7 \\ \hline f_i & 5 & 3 & 1 & 6 & 6 & 1 \\ \hline \end{array}$$

If three dice are thrown, then the mean of the sum of the numbers appearing on them is

The probability distribution of a random variable $X$ is given below. Then, the standard deviation of $X$ is

$$\begin{array}{llllll} \hline \boldsymbol{X}=\boldsymbol{x}_1 & 2 & 3 & 5 & 7 & 12 \\ \hline \boldsymbol{P}\left(\boldsymbol{X}=\boldsymbol{x}_1\right) & 3 k & k & k & 2 k & k \\ \hline \end{array}$$

The mean deviation from the mean of the discrete data $2,3,5,7,11,13,17,19,22$ is

The variance of the discrete data $3,4,5,6,7,8,10,13$ is

If a possion variate $X$ satisfies the relation $P(X=3)=P(X=5)$, then $P(X=4)=$

The mean deviation about median of the numbers $3 x, 6 x, 9 x, \ldots .81 x$ is 91 , then $|x|=$

$$\text { The coefficient of variation for the following data is }$$

$$\begin{array}{llllll} \hline \text { Class interval } & 0-2 & 2-4 & 4-6 & 6-8 & 8-10 \\ \hline \text { Frequency } & 2 & 3 & 5 & 3 & 2 \\ \hline \end{array}$$