Consider the following data:
25  24  18  20 
21  18  16  20 
23  17  15  13 
19  23  24  20 
16  26  21  24 
15  22  16  12 
20  23  19  26 
20  25  21  19 
21  25  23  26 
21  19  20  14 
(a)  Develop a frequency distribution using classes of 1214, 1517, 1820, 2123, and 2426.  


(b)  Develop a relative frequency distribution and a percent frequency distribution using the classes in part (a). If required, round your relative frequency answers to three decimal places and percent frequency answers to one decimal place.  

(a)
Class  Frequency 
12  14  3 
15  17  6 
18 20  12 
21  23  10 
24  26  9 
Total  40 
Note: frequency of class 12 14 means how many numbers in the observation are lies in the class 12  14.
(b)
Class  Frequency  Relative frequency  Percent frequency 
12 to 14  3  0.075  7.5% 
15 to 17  6  0.15  15% 
18 to 20  12  0.3  30% 
21 to 23  10  0.25  25% 
24 to 26  9  0.225  22.5% 
Total  40 
Relative frequency =( Frequency / total of frequency)
Percent frequency = Relative frequency * 100
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