what is the size of the class interval (0-4)
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Step-by-step explanation:
The frequency distribution table for the given marks can be drawn as:

(i) The class interval (40−49) has the highest frequency and the class interval (90−99) has the lowest frequency.
(ii) In the class interval (30−39), the lower limit is 30 − 0.5 = 29.5 and the upper limit is
39 + 0.5 = 39.5.
(iii) The range of the given distribution is 97− 32 = 65
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