344 MATHEMATICS
File Name : C:\Computer Station\Maths-IX\Chapter\Answers (16–12–2005) PM65
(ii) The data appears to be taken in the rainy season as the relative humidity is high.
(iii) Range = 99.2 – 84.9 = 14.3- (i) Heights (in cm) Frequency
150 - 155 12
155 - 160 9
160 - 165 14
165 - 170 10
170 - 175 5
Total 50
(ii) One conclusion that we can draw from the above table is that more than 50% of
students are shorter than 165 cm.- (i) Concentration of Frequency
Sulphur dioxide (in ppm)
0.00 - 0.04 4
0.04 - 0.08 9
0.08 - 0.12 9
0.12 - 0.16 2
0.16 - 0.20 4
0.20 - 0.24 2
Total 30(ii) The concentration of sulphur dioxide was more than 0.11 ppm for 8 days.- Number of heads Frequency
06
110
29
35
Total 30