MCQ
Which of the following is correct for $A - B?$
- A$\text{A } \cap \text{ B}$
- B$\text{A }' \cap \text{ B}$
- ✓$\text{A } \cap \text{ B}'$
- D$\text{A }' \cap \text{ B}'$
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| Class: | $0-6$ | $6-12$ | $12-18$ | $18-24$ | $24-30$ |
| Frequency : | $a$ | $b$ | $12$ | $9$ | $5$ |
If mean $=\frac{309}{22}$ and median $=14$, than value $(a-b)^{2}$ is equal to $.....$