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The variance of 20 observations is 5. If...

The variance of 20 observations is 5. If each observation is multiplied by 2 find the variance of the resulting observations.

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RD SHARMA ENGLISH-STATISTICS-All Questions
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  2. Find the mean, variance and standard deviation for the following dat...

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  4. The variance of 15 observations is 4. If each observations increased b...

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  5. The mean of 5 observations is 4.4 and their variance is 8.24. If three...

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  9. The mean and standard deviation of 100 observations were calculated as...

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  13. Find the variance and standard deviation for the following distribu...

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