RS Aggarwal Solutions Class 9 Maths Chapter 16 Presentation of Data in Tabular Form

Answer:

(i) Variate: Any character that is capable of taking several different values is called a variant or a variable. (ii) Class interval: Each group into which the raw data is condensed is called a class interval. (iii) Class size: The difference between the true upper limit and the true lower limit of a class is called its class size. (iv) Class mark of a class: The class mark is given by Upper limit+Lower limit2. (v) Class limit: Each class is bounded by two figures, which are called class limits. (vi) True class limits: In the exclusive form, the upper and lower limits of a class are respectively known as true upper limit and true lower limit. In the inclusive form of frequency distribution, the true lower limit of a class is obtained by subtracting 0.5 from the lower limit, and the true upper limit of the class is obtained by adding 0.5 to the upper limit. (vii) Frequency of a class: The frequency of a class is the number of times an observation occurs in that class. (viii) Cumulative frequency of a class: Cumulative frequency of a class is the total of all the frequencies up to and including that class.