Question

In a class of 30 students, 12 have a cat and 19 have a dog. There are 6 students who

do not have a cat or a dog. What is the probability that a student chosen randomly
from the class has a dog?

Answer 1

P(dog) = 12/30 = 0.4 or 40%

Explanation:

We can use the formula for probability:

P(dog) = number of students with a dog / total number of students

To find the number of students with a dog, we can use the fact that 19 students have a dog and 6 students have neither a cat nor a dog:

number of students with a dog = total number of students - number of students with no pets - number of students with only a cat

number of students with a dog = 30 - 6 - 12 = 12

So the probability that a student chosen randomly from the class has a dog is:

P(dog) = 12/30 = 0.4 or 40%