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Illustration 1
In a described exam the scores for 10 students were given as:
Student
Mark (x)
|x-x¯|
A
60
1.8
B
45
16.8
C
75
13.2
D
70
8.2
E
65
3.2
F
40
21.8
G
69
7.2
H
64
2.2
I
50
11.8
J
80
18.2
Total
618
104.4
Required
Find out the absolute mean deviation
Mean, x¯ = 618/10 = 61.8
3 3/7 + 2 8/9 * 4=
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the value of y for which x=-1.5
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