1.

The following information is related to the sample of the size of  \(60, \sum x^2=18000, \ \sum x=960\), So variance isA. 55B. 44C. 22D. 161. D2. B3. A4. C

Answer» Correct Answer - Option 2 : B

Given:

Sample size = 60

\(\sum x^2=18000, \ \sum x=960\)

Formula used:

\({\rm{Variance\;}} = {\rm{\;}}\frac{1}{{\rm{n}}}\sum {{\rm{x}}^2}\; - \;{\left( {\frac{{\sum {\rm{x}}}}{{\rm{n}}}} \right)^2}\)

Where, 

n = sample rate

Calculation:

Variance

⇒ (1/60) × 18000 - (960/60)2

⇒ 300 - (16)2

⇒ 300 - 256

⇒ 44

∴ The variance is 44.



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