MCQ
Mode is found graphically by:
- AFrequency polygon.
- BOgive.
- ✓Histogram.
- DNone of these.
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|
Value
|
No. of observations
|
|
More than $200$
|
$56$ |
|
More than $250$
|
$38$ |
|
More than $300$
|
$15$ |
|
More than $350$
|
$0$ |
| S. No. | Method | Formula |
| (i) | Direct Method | $\text{r}=\frac{\Sigma\text{dxdy.n}-(\Sigma\text{dx})(\Sigma\text{dy})}{\sqrt{\Sigma\text{dx}^2.\text{n}(\Sigma\text{dx})^2(\sqrt{\Sigma\text{dy}^2-(\Sigma\text{dy})^2}}}$ |
| (ii) | Short-Cut Method | $\text{r}=\frac{\Sigma\text{xy}}{\text{n}.\sigma_\text{x}.\sigma_\text{y}}$ |
| (iii) | Step Deviation Method | $\text{r}=\frac{\text{dx'dy'.n}-(\Sigma\text{dx'})(\Sigma\text{dy'})}{\sqrt{\Sigma\text{dx'}.\text{n}(\Sigma\text{dx'})^2(\sqrt{\Sigma\text{dy'}-(\Sigma\text{dy'})^2}}}$ |