When rolling a standard six-sided die, the possible outcomes are the numbers 1, 2, 3, 4, 5, and 6. To find the probability of rolling a number less than 5, we first identify which numbers on the die meet this criterion. The numbers less than 5 are 1, 2, 3, and 4.
Counting these, we find there are 4 favorable outcomes (1, 2, 3, and 4). The total number of possible outcomes when rolling the die is 6 (since there are 6 sides).
The probability (P) of an event can be calculated using the formula:
P(Event) = (Number of Favorable Outcomes) / (Total Number of Possible Outcomes)
Substituting the numbers we have:
P(Rolling a number less than 5) = 4 / 6 = 2 / 3
Thus, the probability of rolling a number less than 5 on a six-sided die is 2/3.