Question

A stopwatch was used to find the time that it took a group of students to run 100m.

Time (in sec) 0-20 20-40 40-60 60-80 80-100

No. of

students

6 8 13 11 12

Estimate the mean time taken by a student to finish the race.

(i)54 (ii)63 (iii)43 (iv)56​

Answer 1

Given : time that it took a group of students to run 100m.

Time (in sec)    0-20 20-40 40-60 60-80 80-100

No. of  students   6         8         13        11         12

To Find : Mean Time

Solution:

Time (in sec)  students  f        Mean      mean * f

0-20                   6                    10               60

20-40                8                    30               240

40-60                13                   50              650

60-80                11                    70              770

80-100                12                   90             1080

                       50                                       2800

Mean Time = 2800/50

= 56  

the mean time taken by a student to finish the race. = 56  

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