Question

Find the probability of rolling a prime number when an 18 sided dice is rolled?

Answer 1

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The total number of outcomes in an 18 sided dice roll is all numbers from 1 to 18 = 18

Lets count the number of prime outcomes in the dice between 1 and 18: 2, 3, 5, 7, 11, 13, 17 = 7 ( 2 is also a prime number, its not an even number as it has only 2 factors: 1 and itself)

Probability of rolling a prime number

= tota prime numbers from 1 to 18 / total numbers between 1 and 18

= 7/18

= 0.389718

= 0.3889

Answer: 0.3889