The data table of the given class is;
Total number of students in the class = 4 + 2 + 3 + 15
Total number of students in the class = 24
Number of student who has a sister and donot have a brother = 2
Required probability a student has a sister given that they
do not have a brother;
[tex]\begin{gathered} \text{ Probability =}\frac{Number\text{ of students has a sister but donot have a brother}}{Total\text{ number of students}} \\ \text{Probability}=\frac{2}{24} \\ \text{Probability}=\frac{1}{12} \\ \text{Probability}=0.083 \end{gathered}[/tex]Answer : 0.083
