Question

What is the probability that a randomly selected positive integer greater than 2 and less than 18 will be prime? Please explain! Thanks

Answer 1

Here we have selected positive numbers from 2 to 18 so there are total 17 numbers with us.

Now the prime numbers between 2 and 17 are

2, 3, 5, 7, 11, 13, 17

So there are 7 prime numbers between 2 to 18

We have to find the probability of selecting prime numbers between 2 to 18

Probability = Outcomes of interest / All possible outcomes

Probability prime = 7/17

Probability prime = 0.4117

So probability of getting prime number is 0.4117