Question

On one page of a telephone directory, there are 200 phone numbers. The frequency distribution of their unit’s digits is given below: Unit’s digit 0 1 2 3 4 5 6 7 8 9 Frequency 19 22 23 19 21 24 23 18 16 15 One of the numbers is chosen at random from the page. What is the probability that the unit’s digit of the chosen number is (i) 5? (ii) 8? Select the correct answer from above options

Answer 1

It is given that Total number of phone numbers = 200 (i) We know that Number of phone numbers with 5 = 24 So we get Required probability = number of phone numbers with 5/ Total number of phone numbers By substituting the values Required probability = 24/100 = 0.12 (ii) We know that Number of phone numbers with 8 = 16 So we get Required probability = number of phone numbers with 8/ Total number of phone numbers By substituting the values Required probability = 16/200 = 0.08