NCERT Class 9 Mathematics

ANSWERS/HINTS 345

File Name : C:\Computer Station\Maths-IX\Chapter\Answers (16–12–2005) PM65

7. (i) Digits Frequency

02

15

25

38

44

55

64

74

85

98

Total 50

(ii) The most frequently occurring digits are 3 and 9. The least occurring is 0.

8. (i) Number of hours Frequency
   0 - 5 10
   5 - 10 13
   10 - 15 5
   15 - 20 2

Total 30

(ii) 2 children.

9. Life of batteries Frequency
   (in years)
   2.0 - 2.5 2
   2.5 - 3.0 6
   3.0 - 3.5 14
   3.5 - 4.0 11
   4.0 - 4.5 4
   4.5 - 5.0 3

Total 40