A six-side number q is to be rolled 30 times how many times do you expect to roll on an even number
Assuming the dice is fair and each side has an equal probability of being rolled, the probability of rolling an even number on a six-sided dice is 1/2.
So, for each roll, the expected number of times you will roll an even number is 1/2.
Therefore, if you roll the dice 30 times, you can expect to roll an even number approximately 30 * 1/2 = 15 times.