Selina Concise Class 7 Math Chapter 21 Data Handling Exercise 21A Solutions
EXERCISE 21A
(1) Consider the following numbers:
(i) 52, 63, 63, 68, 70, 71, 73, 75, 75, 76, 77, 82, 83, 90, 92, 93, 99, 103, 105, 115
(ii) Range of given numbers = Largest number – smallest number
⇒ Range of given numbers = 115 – 52 = 63
(2) Represent the following data in the form of a frequency distribution table:
(3)
Numbers | Tally-Marks | Frequency |
1 | |||| | 4 |
2 | |||| | 4 |
3 | ||| | 3 |
4 | ||| | 3 |
5 | ||| | 3 |
6 | ||| | 3 |
Total | 20 |
(4)
Wages (in Rs) | Tally-Marks | Frequency |
3500 | | | 1 |
3750 | | | 1 |
4000 | |||| | 4 |
4250 | ||| | 3 |
4750 | | | 1 |
Total | 10 |
(5)
(6) Arrange the following data in descending order:
⇒ 4.1, 4.0, 3.9, 3.9, 3.8, 3.8, 3.7, 3.7, 3.6, 3.5, 3.4, 3.3, 3.2, 3.1
(i) 4.1 – 3.1 = 1
(ii) 3.1, 3.2, 3.3, 3.4 = 4 numbers
(iii) 3.8, 3.8, 3.9, 3.9, 4.0, 4.1 = 6 numbers
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