For the non-overlapping classes 0—19 , 20—39 , 40—59 the class mark of the class 0—19 is(a) 0(b) 19(c) 9.5(d) none of these
Question
For the non-overlapping classes 0—19 , 20—39 , 40—59 the class mark of the class 0—19 is(a) 0(b) 19(c) 9.5(d) none of these
Solution
To find the class mark of the class 0—19, we need to calculate the midpoint of the class interval.
The class interval 0—19 has a lower limit of 0 and an upper limit of 19. To find the midpoint, we add the lower limit and the upper limit and divide the sum by 2.
So, the class mark of the class 0—19 is (0 + 19) / 2 = 9.5.
Therefore, the correct answer is (c) 9.5.
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