NCERT Class 9 Mathematics

ANSWERS/HINTS 343

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

2. Primary data; (i), (ii) and (iii)
   Secondary data; (iv) and (v)

EXERCISE 14.2

1. Blood group Number of students
   A9
   B6
   O1 2
   AB 3
   Total 30

Most common – O , Rarest – AB

2.

Distances Tally Marks Frequency

(in km)

0 - 5 |||| 5

5 - 10 |||| |||| | 11

10 - 15 |||| |||| | 11

15 - 20 |||| |||| 9

20 - 25 | 1

25 - 30 | 1

30 - 35 || 2

Total 40

3. (i) Relative humidity (in %) Frequency
   84 - 86 1
   86 - 88 1
   88 - 90 2
   90 - 92 2
   92 - 94 7
   94 - 96 6
   96 - 98 7
   98 - 100 4

Total 30