Fill in the blanks :
(i) The number of observations in a particular class is called ……of the class.
(ii) The difference between the class marks of two consecutive classes is the
of the class.
(iii) The range of the data 16, 19, 23, 13, 11, 25, 18 is…
(iv) The mid-point of the class interval is called its …
(v) The class mark of the class 4 – 9 is ….
Solution:
(i) The number of observations in a particular class is called frequency of the class.
(ii) The difference between the class marks of two consecutive classes is the size of the class.
(iii) The range of the data 16, 19, 23, 13, 11, 25, 18 is 14.
(iv) The mid-point of the class interval is called its class marks.
(v) The class mark of the class 4 – 9 is 6.5. [Class mark = (4 + 9)/2 = 13/2 = 6.5]
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