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Class Mid points
This is very significant values which mark the center of a provided class. They are acquired by adding together the two limits of a provided class and dividing the result by 2.
Class interval or width
It is the difference between a lower class boundary and upper class boundary. The value normally measures the length of a provided class.
Age (yrs)
No. of Students (f)
mid points (x)
x-a = d
D/c = u
fu
15 - 19
21
17
-15
-3
-63
20 - 24
35
22
-10
-2
-70
25 - 29
38
27
-5
-1
-38
30 - 34
49
32(A)
0
35 - 39
31
37
+5
+
40 - 44
19
42
+10
+2
193
-102
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What is the answer for I am greater than 30 and less than 40. The sum of my digits is less than 5.
A vertical post stands on a horizontal plane. The angle of elevation of the top is 60 o and that of a point x metre be the height of the post, then prove that x = 2 h/3 .
what to do
(x^3-9/5x^2+8/5x-4)
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