Question

An integer is chosen between 0 & 20 .find the probability that the chosen integer is a prime number.

Answer 1

The prime numbers between 0&20 are 2,3,5,7,11,13,17,19.

There are 8 prime numbers.

We know that, Probability = Possible outcomes / Total outcomes.

We have 8 primes in 19 numbers as the question is asking between 0 & 20

Number of numbers between a& b = b -a-1

So, numbers between 0 & 20 = 20-0-1=19

So probability of getting a prime number when drawn = 8/19

Therefore :- the probability that the chosen integer is a prime number when chosen between 0&20 is 8/19

Answer 2

Solution:


The total number of integers between 0 & 20= 19

The total number of outcomes = 19

Prime numbers between 0 to 20 = {2, 3, 5, 7, 11, 13, 17, 19}


No. Of prime numbers between 0 to 20= 8


No. Of favourable outcomes= 8

Probability(prime numbers between 0 to 20) =No. Of favourable outcomes/   total number of outcomes


P(prime number) = 8/19


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Hope this will help you...