Answer:
a. 6
b. 18-21.9
c. 4
Step-by-step explanation:
a)
The number of classes can be assessed by counting the number of class intervals
S.no Class interval
1 10-13.9
2 14-17.9
3 18-21.9
4 22-25.9
5 26-29.9
6 30-33.9
Hence, there are 6 number of classes
b)
The class limits for third class is 18-21.9.
Upper class limit= 18
Lower class limit=21.9
c)
The class width can be calculated by taking difference of two consecutive upper class limits or two consecutive lower class limits.
Class width=14-10=4
Given the class intervals :
Class interval :
10-13.9
14-17.9
18-21.9
22-25.9
26-29.9
30-33.9
The classes are : 10-13.9; 14-17.9; 18-21.9; 22-25.9; 26-29.9; 30-33.9 ; This means that the number of classes is 6
The class limit for the third class :
The third class interval from the list is : (18 - 21.9)
The lower limit of the third class = 18
The upper limit of the third class = 21.9
The class width is the difference between the upper and lower class limit of each class :
Upper limit - lower limit = (21.9 - 18) = 3.9
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