TS EAMCET · Maths · Statistics
The mean of four observations is 3 . If the sum of the squares of these observations is 48 , then their standard deviation is
- A \(\sqrt{7}\)
- B \(\sqrt{2}\)
- C \(\sqrt{3}\)
- D \(\sqrt{5}\)
Answer & Solution
Correct Answer
(C) \(\sqrt{3}\)
Step-by-step Solution
Detailed explanation
Let four observations are be \(x_1, x_2, x_3\) and \(x_4\) Given, mean and \[ \begin{aligned} (\bar{x}) & =3 \\ \Sigma x_i^2 & =48 \end{aligned} \]…
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