S Chand ICSE Mathematics Class 9 Solution Fourteenth Chapter Introduction Data and Frequency Distributions Exercise 14
(1) Fill in the blanks
(i) The difference between the maximum and minimum observations in a set of data is called the _____ of the data.
Solution: Range
(ii) The number of observations in a particular class inte7rval is called the _____ of the class interval.
Solution: Frequency.
(2) (i) Lower limit of the class interval 26 – 33 is _______
Solution: 26
(ii) Upper limit of the class interval 21 – 25 is ______
Solution: 25
(iii) The class mark of the class interval 20 – 29 is ______
Solution: Class mark = 20 + 29 / 2
= 49 / 2
= 24.5
(iv) The class mark of the class interval 9.5 – 19.5 is ______
Solution: Class mark= 9.5 + 19.5 / 2
= 29 / 2
= 14.5
(v) If the class marks of a distribution are 32, 39, 46, 53; then the width of each class interval is _______
Solution: (39 – 32) = (46 = 39) = (53 – 46)
(vi) The mid – point of a class interval is called its ______
Solution: Class mark
(vii) If the class marks of a distribution are 28, 34, 40, 46, 52, then the class interval are of length ________
Solution: 6 = (34 – 28) = (40 – 34) = (46 – 40) = (52 – 46)
(viii) If the class marks in a frequency distribution are 19.5, 26.5, 33.5, 40.5, 47.5, 54.5, 61.5, then the class size of the distribution is ________
Solution: 7
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