

9th Mean Median and Mode Test Paper1
Download File 9th Mean Median and Mode Test Paper2 Download File 
The following frequency distribution gives the masses of 48 objects measured to the nearest gram. Draw a histogram to illustrate the data.
Mass (g) 
10 – 19 
20 – 24 
25 – 34 
35 – 50 
51 – 55 
Frequency 
6 
4 
12 
18 
8 
Solution:
Evaluate each class widths. Since the class widths are not equal, we choose a convenient width as a standard and adjust the heights of the rectangles accordingly.
We notice that the smallest width size is 5. We can choose 5 to be the standard width. The other widths are then multiples of the standard width.
Mass (g) 
10 – 19 
20 – 24 
25 – 34 
35 – 50 
51 – 55 
Frequency 
6 
4 
12 
18 
8 
Class width 
10 
5 
10 
15 
5 
Adjusted Frequency (Rectangle’s height in histogram) 
(5/10) x 6 = 3 
4 
(5/10)x12=6 
(5/15)x18= 6 
8 