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On one page of a telephone directory, there are 200 phone numbers. The frequency distribution of their unit digits is given below: One of the number is chosen at random from the page. The probability that the unit digit of the chosen number is 5 is ____.

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Detailed Solution

On one page of a telephone directory, there are 200 phone numbers. The frequency distribution of their unit digits is given below: One of the number is chosen at random from the page. The probability that the unit digit of the chosen number is 5 is 0.12.
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Given the frequency distribution of 200 phone numbers.
Number of phone numbers having units digit as 5 = 24
And, total number of outcome = 200
Now, the probability that the unit digit of the chosen number is 5 is,

= Number of phone numbers having units digit as 5 Total number of outcomes = 24200

= 12100 = 0.12

Hence, the probability is 0.12.

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