A number is selected at random from the numbers 1 to 30. What is the probability that the selected number is a prime number?
Let E be the event of selecting a prime number
Total numbers of elementary events are 30
Favourable numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Number of favourable outcome = 10
P (E) = 10/30 =1/3