A Dice is rolled 258 times. How many times would you expect to get an odd prime number?

For a die, the possiblilities are:  1, 2, 3, 4, 5, 6. Of these numbers, the odd prime numbers are 3 and 5 (1 isn't called a prime).

So, the probability of getting an odd prime number is 1/3.

One-third of 256 chances is 85.333 times --> 83 times.