MCQ
$\lim _{x \rightarrow 0} \frac{|x|}{x}=$
- A1
- B-1
- C$0$
- ✓does not exist
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If for some positive $x \in R$, the frequency distribution of the marks obtained by 20 students in a certain test, is as follows:
| Marks | 2 | 3 | 5 | 7 |
| Frequency | $(x+1)^2$ | $2 x-5$ | $x^2-3 x$ | x |
Then the mean of the marks is