A number cube is labeled with the numbers 1 through 6 . What is the probability of rolling a 1 or a 5 on the first roll?
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To find the probability of rolling a 1 or a 5 on the first roll of a number cube, we need to determine the number of favorable outcomes and the total number of possible outcomes.
In this case, the number cube is labeled with numbers 1 through 6. So, there are 6 possible outcomes (numbers) when we roll the cube.
Now, let's determine the number of favorable outcomes, which are rolling a 1 or a 5. There are two favorable outcomes: rolling a 1 or rolling a 5.
So, the probability of rolling a 1 or a 5 on the first roll can be calculated by dividing the number of favorable outcomes by the total number of possible outcomes.
Probability = Number of Favorable Outcomes / Total Number of Possible Outcomes
Probability = 2 / 6 = 1 / 3
Therefore, the probability of rolling a 1 or a 5 on the first roll is 1/3.