The probability that a student, chosen at random, studies Biology or Physics or both is 50%.
The Venn diagram shows the number of students studying different science subjects, namely Biology, Physics, and Chemistry. There is a total of 18 students in the diagram.
Biology: 5 students
Physics: 1 student
Chemistry: 9 students
Biology and Physics: 3 students
Biology and Chemistry: 4 students
Physics and Chemistry: 8 students
All three subjects: 4 students
To find the probability that a student, chosen at random, studies Biology or Physics or both, we need to add the number of students in each of these categories and divide by the total number of students.
Probability: (5 + 1 + 3) / 18 = 9 / 18 = 0.5 or 50%