Selina Concise Mathematics Class 9 ICSE Solutions Statistics Selina ICSE Solutions for Class 9 Maths Chapter 18 Statistics Exercise 18(A) 1. State, which of the following variables are continuous and which are discrete: (a) Number of children in your class. (b) Distance travelled by a car. (c) Sizes of shoes. (d) Time. (e) Number of patients in a hospital. Solution 1: (a) Discrete variable. (b) Continuous variable. (c) Discrete variable. (d) Continuous variable. (e) Discrete variable. 2. Given below are the marks obtained by 30 students in an examination: 08 17 33 41 47 23 20 34 09 18 42 14 30 19 29 11 36 48 40 24 22 02 16 21 15 32 47 44 33 01 Taking class intervals 1 - 10, 11 - 20, ....., 41 - 50; make a frequency table for the above distribution. Solution 2: 3. The marks of 24 candidates in the subject mathematics are given below: 45 48 15 23 30 35 40 11 29 ...
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