From the list of telephone numbers of $100$ employees of a factory, the following frequency distribution of their unit place digit (for example, in the number $25828573$, the unit place digit is $3$) is given in the table below:
Unit digit $0$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ Frequency $8$ $9$ $12$ $15$ $10$ $7$ $12$ $10$ $9$ $8$
Find the probability that a randomly selected employee has a telephone number with unit digit $3$.
| Unit digit | $0$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ |
| Frequency | $8$ | $9$ | $12$ | $15$ | $10$ | $7$ | $12$ | $10$ | $9$ | $8$ |
Find the probability that a randomly selected employee has a telephone number with unit digit $3$.
- A$0.17$
- B$0.15$
- C$0.13$
- D$0.10$
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$A$ recent survey found that the ages of workers in a factory is distributed as follows:
Age (in years) $20-29$ $30-39$ $40-49$ $50-59$ $60$ and above Number of workers $38$ $27$ $86$ $46$ $3$
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