CBSE Class 11-commerce Answered
Q.7 The following table gives the marks obtained by 10 students of a class. (3)
S.No. 1 2 3 4 5 6 7 8 9 10
Marks 43 60 37 48 65 48 57 78 31 59
Find out mean marks, using Direct method as well as short-cut method.
Asked by sntshtrk530 | 04 Sep, 2017, 04:36: AM
Expert Answer
Students |
Marks(x) |
d = X - A |
1 |
43 |
-22 |
2 |
60 |
-5 |
3 |
37 |
-28 |
4 |
48 |
-17 |
5 |
65 = A |
0 |
6 |
48 |
-17 |
7 |
57 |
-8 |
8 |
78 |
13 |
9 |
31 |
-34 |
10 |
59 |
-6 |
|
∑X = 526 |
∑d = -124 |
Now apply the formula to arrive arithmetic mean.
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