The prime numbers on the die are 2,3,5,7
The non-primes are 1,4,6,8. So the theoretical
probability of rolling a prime is 1/2, and the
theoretical probability of rolling a non-prime
is also 1/2. 1/2 is 50%.
For the experimental sequence of 20 rolls, I
will put P's under the prime numbers.
3 4 5 2 7 1 3 7 2 6 2 1 7 3 6 1 8 3 5 6
P P P P P P P P P P P
There are 11 primes out of 20, so the experimental
probability is 11/20 = 0.55 or 55%.
The experimental probability of rolling a prime number is 55%,
which is 5% more than the theoretical probability of 50%.
Edwin