1/6
Assuming that the faces of the 20 sided die are numbered 1 to 20, then the probability of rolling a number less than 9 is 8 in 20, or 0.4.
Assuming the 4-sided die is numbered 1 to 4 and the 12 sided one is numbered 1-12, the answer is 4/(4*12) = 1/12
Assuming that the four-sided spinner is fair and that it is numbered in the traditional way of 1, 2, 3 and 4, the probability of spinning a three is 1/4.
On a single roll, the probability is 1/2.
Assuming the faces are numbered 1 to 12, and the die is fair, the mean value is 6.5
If the faces on the 12 sided die are numbered from 1 to 12, then 1/12.
It is 3/4.
7-12
That's going to depend on how many numbered sides the "cube" has, and howthey're numbered.If it's literally a six-sided cube, with the faces numbered 1 through 6, then the onlymultiple of 4 anywhere on it is 4, and the probability of rolling the 4 is1/6 or (16 and 2/3) percent.
Assuming that the faces of the 20 sided die are numbered 1 to 20, then the probability of rolling a number less than 9 is 8 in 20, or 0.4.
The probability of rolling a four on an eight sided octahedron is 1 in 8, or 0.125.
Assuming the 4-sided die is numbered 1 to 4 and the 12 sided one is numbered 1-12, the answer is 4/(4*12) = 1/12
Assuming that the four-sided spinner is fair and that it is numbered in the traditional way of 1, 2, 3 and 4, the probability of spinning a three is 1/4.
On a single roll, the probability is 1/2.
The probability that the sum of the numbers rolled is either even or a multiple of 5 is 11/18.
Since there are 3 prime numbers, 13, 17, and 19, in the range 12 to 19, the probability of throwing a prime number on a fair eight sided die numbered 12 to 19 is 3 in 8.
The answer depends on what numbers are on the faces of the dice.