On one page of a telephone directory, there are 200 phone numbers. The

1.	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 digit0123456789Frequency19222319212423181615One 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?
Answer» 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

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 digit0123456789Frequency19222319212423181615One 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?

Answer»

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

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