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I need answers for the following with explanation. they are based on chapter of statistics

1. range of first 20 natural numbers 2. A.M. of a-2, a, a+2 3. mid point of class interval 25-40 4. median of 4,5,1,8,7,9,10 5. mean=x, median=y, mode=? 6. median of even natural numbers between 1 and 20 7. mean of first 'n' natural numbers 8. what should we take on X-axis to draw 'less than' ogive graph 9. cumulative frequency is used to find ___________ 10. mean of the first 3 composite numbers,