Answer:
20/41
Explanation:
The total of all students is ...
7 + 2 + 5 + 6 + 3 + 4 + 6 + 8 = 41
The total of students not studying chemistry is ...
7 + 2 + 5 + 6 = 20
Then the probability that a randomly-chosen student does not study chemistry is ...
p(not studying chem) = 20/41