Question

12. Following are the marks out of (100) obtained by students in a test.
70 55 51
42 57 45 60 47
63
53 33
19
82 55 64 50 25 65 75 30 20 58 52
15
| 42 35 40 61 53 59 49 41 IS 52 46 42
45 39 55 65 45 63 54 48 64 35 26
(i) Make a frequency distribution taking a class interval of 10 marks. (Take the first class interval as 0 10 )
(in) Draw a histogram and a frequency polygon for the frequency distribution
(iii) Find out the average marks of the students
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Answer 1

Answer:

Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.

Explanation: