New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Data Handling Self Practice 15C Solution
(1)
(a) 5, 3, 5, 2, 3, 5, 17
Mode – 5
(b) 1, 7, 13, 19, 25
= No Mode
(c) 4, 6, 8, 4, 10, 4, 6, 12, 6, 10
= Modes – 4, 6
(d) 51, 68, 70, 76, 55, 70, 73, 68, 70, 81
= Mode – 70
(e) 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4
= Modes – 8, 4
(f) 29, 29, 10, 10, 3, 3, 14, 10, 2, 2
= Mode – 10
(g) 26, 32, 26, 21, 83, 26, 83, 67, 53, 83, 85
= Modes – 26, 83
(2)
(a)
Size | 2 | 3 | 4 | 5 | 6 | 7 |
Frequency | 4 | 6 | 2 | 5 | 3 | 1 |
Mode – 3
(b)
Size of shoes | 6 | 7 | 8 | 9 | 10 |
No. of persons | 12 | 20 | 40 | 15 | 7 |
Mode – 8
(3)
(a) 1, 6, 8, 11, 11, 11, 14, 16, 21
(i) The mode = 11
(ii) The median = 11
(iii) The mean = (1+6+8+11+11+11+14+16+21)/9
= 99/9
= 11
(4) Number of fiction books read by 28 grade VII pupils:
4,6,1,7,3,9,5,7,8,5,4,6,10,6,9,5,6,6,8,6,8,5,10,7,2,5,3,7
Mode = 6
Mean = (4+6+1+7+3+9+5+7+8+5+4+6+10+6+9+5+6+6+8+6+8+5+10+7+2+5+3+7)/28
= 168/28
= 6
(5) 20,21,19,22,18,23,25,22,23,20,23,20,22,21,24,21,22,23,19,21,22,22,24,26,22
Mode = 22
Mean = (20+21+19+22+18+23+25+22+23+20+23+20+22+21+24+21+22+23+19+21+22+22+24,26+22)/25
= 550/25
= 22
(6)
(a) T
(b) F
(c) T