The variance of $\alpha$, $\beta$ and $\gamma$ is $9$, then variance of $5$$\alpha$, $5$$\beta$ and $5$$\gamma$ is
The variance of $\alpha$, $\beta$ and $\gamma$ is $9$, then variance of $5$$\alpha$, $5$$\beta$ and $5$$\gamma$ is
- A
$45$
- B
$9\over5$
- C
$5\over9$
- D
$225$
Similar Questions
The mean and the variance of five observations are $4$ and $5.20,$ respectively. If three of the observations are $3, 4$ and $4;$ then the absolute value of the difference of the other two observations, is
The mean and the variance of five observations are $4$ and $5.20,$ respectively. If three of the observations are $3, 4$ and $4;$ then the absolute value of the difference of the other two observations, is
- [JEE MAIN 2019]
Find the mean and variance for the data
${x_i}$
$6$
$10$
$14$
$18$
$24$
$28$
$30$
${f_i}$
$2$
$4$
$7$
$12$
$8$
$4$
$3$
Find the mean and variance for the data
| ${x_i}$ | $6$ | $10$ | $14$ | $18$ | $24$ | $28$ | $30$ |
| ${f_i}$ | $2$ | $4$ | $7$ | $12$ | $8$ | $4$ | $3$ |
The mean and variance of $7$ observations are $8$ and $16,$ respectively. If five observations are $2, 4, 10,12,14,$ then the absolute difference of the remaining two observations is
The mean and variance of $7$ observations are $8$ and $16,$ respectively. If five observations are $2, 4, 10,12,14,$ then the absolute difference of the remaining two observations is
- [JEE MAIN 2020]
If the variance of $10$ natural numbers $1,1,1, \ldots ., 1, k$ is less than $10 ,$ then the maximum possible value of $k$ is ...... .
If the variance of $10$ natural numbers $1,1,1, \ldots ., 1, k$ is less than $10 ,$ then the maximum possible value of $k$ is ...... .
- [JEE MAIN 2021]
The variance of the first $n$ natural numbers is
The variance of the first $n$ natural numbers is