In an experiment with $15$ observations for $x$,the following results were available: $\sum x^2 = 2830$ and $\sum x = 170$. One observation $20$ was found to be wrong and was replaced by the correct value $30$. Then the corrected variance is:
- A$78$
- B$210$
- C$225$
- D$88$
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The mean of a distribution is $4$. If its coefficient of variation is $58\%$,what is the standard deviation of the distribution?
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In an experiment with $15$ observations on $x$,we have $\sum x^2 = 2830$ and $\sum x = 170$. One observation that was $20$ was found to be wrong and was replaced by the correct value $30$. The corrected variance is:
What is the standard deviation of the numbers $31, 32, 33, \dots, 47$?
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View SolutionFind the variance and standard deviation for the following data:
$x_i$ $4$ $8$ $11$ $17$ $20$ $24$ $32$ $f_i$ $3$ $5$ $9$ $5$ $4$ $3$ $1$
| $x_i$ | $4$ | $8$ | $11$ | $17$ | $20$ | $24$ | $32$ |
| $f_i$ | $3$ | $5$ | $9$ | $5$ | $4$ | $3$ | $1$ |
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