(i) The class marks of a distribution are 94, 104, 114, 124, 134, 144 and 154. Determine the class size and the class limits of the fourth class.
(ii) The class marks of a distribution are 9.5, 16.5, 23.5, 30.5, 37.5 and 44.5. Determine the class size and the class limits of the third class.
Solution:
(i) Class size is the difference between two successive class marks
Class size = 104 – 94 = 10
Class limits of the fourth class
Lower limit = 119 and upper limit = 129
(ii) Class size is the difference between two successive class marks
Class size = 16.5 – 9.5 = 7
Class limits of the third class
Lower limit = 20 and upper limit = 27.
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