MCQ
Derivative of $\log _e \sqrt{x}$ is equal to :
- ✓$\frac{1}{2 x}$
- B$\frac{1}{2 \sqrt{x}}$
- C$2 \sqrt{x}$
- D$\frac{1}{2} \sqrt{x}$
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Mean deviation for n observations x1, x2, ...... , xn from their mean x is given by:
$\sum\limits^{\text{n}}_{\text{i}=1}(\text{x}_\text{i}-\bar{\text{x}})$
$\frac{1}{\text{n}}\sum\limits^{\text{n}}_{\text{i}=1}|\text{x}_\text{i}-\bar{\text{x}}|$
$\sum\limits^{\text{n}}_{\text{i}=1}(\text{x}_\text{i}-\bar{\text{x}})^2$
$\frac{1}{\text{n}}\sum\limits^{\text{n}}_{\text{i}=1}(\text{x}_\text{i}-\bar{\text{x}})^2$