COMEDK · Maths · 29. Statistics

If the standard deviation of \(0,1,2,3 .......9\) is ' \(k\) ' then the standard deviation of \(10,11,12,13\),....... 19 will be

A \(k+4\)
B \(k\)
C \(k+10\)
D \(k+8\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(k\)

Step-by-step Solution

Detailed explanation

The standard deviation of a set of observations \(x_1, x_2, ..., x_n\) is given by \(\sigma = \sqrt{\dfrac{1}{n} \sum_{i=1}^{n} (x_i - \bar{x})^2}\). Let the first set of observations be \(X = \{0, 1, 2, ..., 9\}\). The standard deviation of this set is \(k\). The second set of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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