Question

What is the probability of rolling a prime number of a standard 20 sided die? (1 is not a prime number)
7/20
b 215
9/20

Answer 1

Answer:

2/5.

Step-by-step explanation:

The prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17 and 19.

A total of 8.

So the probability of rolling a prime number is 8/20

= 2/5.

Answer 2

Probability of rolling a prime number of a standard 20 sided die is 2/5

What is probability?

• The chance of an event happening when expressed quantitatively is called probability.  

• Probability lies between 0 and 1.

The prime numbers from 1 to 20 are 2,3,5,7,11,13,17 and 19.

Total number of prime numbers from 1 to 20 is 8.

Probability of rolling a prime number = Number of outcomes/Total number of outcomes

= 8/20

=2/5.

Hence, the probability of getting a prime numbers from 1 to 20 is 2/5.

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