Chap 16 (Class Activity) Discrete Data in Freqency Table & Histogram

How much time did S1-09 sleep in a weekday (during term time)?

1. Everybody in the class contributed a raw data point.
(with the number of hours rounded off to the nearest whole number)

Note: 2 points missing from the above photo: 8 hours & 7 hours

2. These raw data are organised in a Frequency Table

No. of Hours

4

5

6

7

8

9

Frequency

1

3

3

7

6

3


3. This set of data is then represented in a histogram:



4. Mean, Median, Mode
  • Mode = 7 hours
  • Median = 7 hours (Obtained by finding the mean of the number of hours of the 12th & 13th persons (in order of magnitude)
  • Mean = 7 hours

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