IBMediumProbability7–9

Of $50$ students surveyed, $30$ walk to school, and $18$ of those who walk are in Year 8. One of the $50$ is chosen at random. What is the probability that the student walks to school and is in Year 8?

De $50$ alunos inquiridos, $30$ vão a pé para a escola e $18$ desses estão no 8.º ano. Escolhe-se um dos $50$ ao acaso. Qual é a probabilidade de o aluno ir a pé e estar no 8.º ano?

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Solution

Step 1 of 2

1.Students who walk and are in Year 8: $18$

Of 505050 students surveyed, 303030 walk to school, and 181818 of those who walk are in Year 8. One of the 505050 is chosen at random. What is the probability that the student walks to school and is in Year 8?

Answer options

Of $50$ students surveyed, $30$ walk to school, and $18$ of those who walk are in Year 8. One of the $50$ is chosen at random. What is the probability that the student walks to school and is in Year 8?