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Q1. Tally marks are used to find 

(a) class intervals 

(b) range 

(c) frequency 

(d) upper limits 

Q2. The difference between the highest and lowest values of the observations is called 

Q3. The difference between t he upper and the lower class limits is called 

Q4. In the class intervals 10-20, 20-30, 20 is takken in 

Q5. In a frequency distribution, the mid value of a class is 15 and the class intervals is 4. The lower limits of the class is  

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