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The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:
Construct a frequency distribution for these data, using a class interval of 10 seconds.
Given:
The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:
16, 20, 26, 27, 28, 30, 33, 37, 38, 40, 42, 43, 46, 46, 46, 48, 49, 50, 53, 58, 59, 60, 64, 52, 20
To do:
We have to construct a frequency distribution for these data, using a class interval of 10 seconds.
Solution:
The frequency distribution for the given data, using a class interval of 10 seconds is,
Lowest observation $= 16$
Highest observation $= 64$
Time taken (in sec) | Tally marks | Number of problems |
10-20 | ||| | 1 |
20-30 | 5 | |
30-40 | |||| | 4 |
40-50 | 8 | |
50-60 | 5 | |
60-70 | || | 2 |
Total | 25 |
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