Question
In a class of students, the following data table summarizes how many students have a brother or a sister. What is the probability that a student chosen randomly from the class has a sister?
Has a sister 6
Does not have a sister 3
Has a brother 12
Does not have a brother 9
Has a sister 6
Does not have a sister 3
Has a brother 12
Does not have a brother 9
Answers
Bot
The probability of a student chosen randomly from the class having a sister is:
Number of students with a sister / Total number of students
= 6 / (6 + 3 + 12 + 9)
= 6 / 30
= 0.2
Therefore, the probability is 0.2 or 20%.
Number of students with a sister / Total number of students
= 6 / (6 + 3 + 12 + 9)
= 6 / 30
= 0.2
Therefore, the probability is 0.2 or 20%.