100 families with two children were selected randomly and the following data were recorded :
`{:("No. of girls in family",2,1,0),("No. of families",12,80,8):}`
Calculate the probability of a family chosen at random having
two girls

Answer

To solve the problem of calculating the probability of a family chosen at random having two girls, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Data Provided**:
We have data on 100 families with two children. The data shows:
- Number of families with 2 girls: 12
- Number of families with 1 girl: 80
- Number of families with 0 girls: 8

2. **Identify Total Families**:
The total number of families surveyed is given as 100.

3. **Identify Favorable Outcomes**:
We need to find the number of families that have 2 girls. From the data, this number is 12.

4. **Calculate the Probability**:
The probability \( P \) of a family having 2 girls can be calculated using the formula:
\[ P(\text{2 girls}) = \frac{\text{Number of families with 2 girls}}{\text{Total number of families}} \]
Substituting the values:
\[ P(\text{2 girls}) = \frac{12}{100} \]

5. **Simplify the Probability**:
Simplifying \( \frac{12}{100} \):
\[ P(\text{2 girls}) = 0.12 \]

6. **Conclusion**:
The probability of a family chosen at random having two girls is \( 0.12 \).

### Final Answer:
The probability of a family chosen at random having two girls is \( 0.12 \).

---