The times, in seconds, taken by 150 athletes to run a 110 m hurdle race are tabulated below :

Class 13.8-14 14-14.2 14.2-14.4 14.4-14.6 14.6-14.8 14.8-15
Frequency 2 4 5 71 48 20

The number of athletes who completed the race in less than 14.6 seconds is :
(A) 11              (B) 71              (C) 82              (D) 130

Answers (1)

Answer.  [C]
Solution. Frequency:- The number of times a event occurs is a specific period is called frequency. 
The number of athletes who are below 14.6  = frequency of class (13.8-14) + frequency of class (14- 14.2) +
frequency of class (14.2-14.4) + frequency of class (14.4-14.6)
= 2 + 4 + 5 + 71 = 82
Hence the frequency of race completed in less than 14.6 = 82

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