MCQ
Which one is different from the others?
- Empty
- Void
- Zero
- Null
- A(i)
- B(ii)
- C(iii)
- D(iv)
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Let x1, x2, ..., xn be n observations and $\bar{\text{x}}$ be their arithmetic mean. The formula for the standard deviation is given by:
$\sum(\text{x}_\text{i}-\bar{\text{x}})^2$
$\frac{\sum(\text{x}_\text{i}-\bar{\text{x}})^2}{\text{x}}$
$\sqrt{\frac{\sum(\text{x}_\text{i}-\bar{\text{x}})^2}{\text{n}}}$
$\frac{\sum\text{x}_\text{i}^2}{\text{n}}-(\bar{\text{x}})^{-2}$