It is impossible to roll a number less than one.
Prob(less than 5 on a roll of a die) = 4/6 = 2/3
On a single roll it is 2/3.
The probability is zero. No number can be less than 3 and greater than 4.
It is 1/2.
The expected number of rolls under 3 is the number of rolls times the probability of rolling less than 3. So: E(rolls less than 3 out of 30) = 30 * 1/3 = 30/3 = 10
1 out of 2
It is not clear whether the question is for "less than 4" or "greater than 4".
With a fair die it is 5/6.
1
Two thirds (2/3)
573 / 1719
4/6 = 2/3 = 662/3%