A 12-sided die is rolled. The set of equally likely outcomes is {1,2,3,4,5,6,7,,8,9,10,11,12}. Find the probability of rolling a number less than 6.
P(X < 6) = P (rolling 1-5)
P(X < 6) = 1/6 + 1/6 + 1/6 + 1/6 + 1/6
P(X < 6) = 5/6
P(X < 6) = P (rolling 1-5)
P(X < 6) = 1/6 + 1/6 + 1/6 + 1/6 + 1/6
P(X < 6) = 5/6