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  • Need explanation for: Find the standard deviation of 7 scores 1,2,3,4,5, 6,7.

Find the standard deviation of 7 scores 1,2,3,4,5, 6,7.

  • Option 1)

    1

  • Option 2)

    2

  • Option 3)

    4

  • Option 4)

    6

Answers (1)

best_answer

As we learned

 

Standard Deviation -

In case of discrete frequency distribution 

\sigma = \sqrt{\frac{\sum f_{i}x_{i}^{2}}{\sum f_{i}}-\left ( \frac{\sum f_{i}x_{i}}{\sum f_{i}} \right )^{2}}

-

 

 Standard deviation of first n natural numbers is  \sqrt{\frac{n^{2}-1}{12}}

For n = 7,  the value = \sqrt{\frac{7^{2}-1}{12}}=\sqrt{4}=2  


Option 1)

1

Option 2)

2

Option 3)

4

Option 4)

6

Posted by

Himanshu

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