In the class intervals 10-20, 20-30,


In the class intervals 10-20, 20-30, the number 20 is included in

(a) 10-20                                 

(b) 20-30

(c) Both the intervals           

(d) None of these


(b) Since, the class interval 10-20 is the first interval of frequency distribution and 20-30 is the next one but the number 20 is present in both

intervals. We know that, the presence of 20 in the interval 10-20 is not fully 100% while in the next interval 20-30, presence of it fully 100%.

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