A cube is rolled 30 times, how many times will it land on 5 or 6?
2/6 * 30
To find out how many times a cube will land on 5 or 6 when rolled 30 times, we need to determine the probability of rolling a 5 or 6 and then multiply it by the number of times the cube is rolled.
In a standard six-sided die, the numbers range from 1 to 6. We want the outcomes when the die lands on 5 or 6. Since there are two favorable outcomes (5 and 6) out of six possible outcomes, the probability of rolling a 5 or 6 on a single roll is 2/6 or 1/3.
To find the expected number of times the cube will land on 5 or 6 in 30 rolls, we simply multiply the probability by the number of times rolled:
Expected number = Probability x Number of rolls
Expected number = (1/3) x 30
Expected number = 10
Therefore, the cube is expected to land on 5 or 6 approximately 10 times out of 30 rolls.