Statistics for Maintenance Modelling: Basic Probability Concepts

# Question on Probability¤

If a die is rolled and we suppose that all six sides are equally likely to appear, what is the probability of rolling a multiple of three? Click on one of the options below, then click on "Check Answer".

1/2
1/3
1/6
Yes, the probability is 1/3, since there are two multiples of three on a die, 3 and 6. So, from axiom 3, the probability is:
P({3}) + P({6}) = 1/6 + 1/6 = 1/3
No, the probability is actually 1/3. This is because there are two multiples of three on a die, 3 and 6. So, from axiom 3, the probability of rolling either of these is:
P({3}) + P({6}) = 1/6 + 1/6 = 1/3