Question

What is the probability of a number selected from the numbers 1, 2, 3,.........20

such that it is a prime number​

Answer 1

Answer:

Probability = 0.4

Step-by-step explanation:

sample space= 20

event (A) = number chosen is prime

favourite for E(A)= {2,3,5,7,11,13,17,19} = 8

therefore,

Probability (A)= 8/20 = 4/10 = 0.4

Answer 2

Answer:

=2/5

Step-by-step explanation:

2,3,5,7,11,13,17,19

These are 8 prime numbers untill 20..

Total outcome is 20

So,8/20=

=4/5