Two teams $A$ and $B$ have the same mean and their coefficients of variation are $4$ and $2$,respectively. If $\sigma_A$ and $\sigma_B$ are the standard deviations of teams $A$ and $B$ respectively,then the relation between them is
- A$\sigma_A = \sigma_B$
- B$\sigma_B = 2 \sigma_A$
- C$\sigma_A = 2 \sigma_B$
- D$\sigma_B = 4 \sigma_A$
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View SolutionFind the mean and variance for the following data:
$x_i$ $6$ $10$ $14$ $18$ $24$ $28$ $30$ $f_i$ $2$ $4$ $7$ $12$ $8$ $4$ $3$
| $x_i$ | $6$ | $10$ | $14$ | $18$ | $24$ | $28$ | $30$ |
| $f_i$ | $2$ | $4$ | $7$ | $12$ | $8$ | $4$ | $3$ |
Medium
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