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Solution


Q.

A stopwatch was used to time a 100-metre race run by a group of students. The sports teacher carefully recorded their times in seconds, which are presented in the table below.

Time (in seconds)

0 – 20

20 – 40

40 – 60

60 – 80

80 – 100

Number of students

8

10

13

6

3

 

Based on the above information, answer the following questions:

 

(i) Find the lower limit of the modal class.
1 40  
2 30  
3 25  
4 15  

Ans.

(1)

Highest frequency = 13
∴ Modal class = 40 – 60

So, lower limit of the modal class = 40