Consider the following distribution of daily wages of 50 workers of a factory.
|
Daily wages |
100-120 |
120-140 |
140-160 |
160-180 |
180-200 |
|
No. of workers |
12 |
14 |
8 |
6 |
10 |
Find the mean daily wages of the workers.
|
Daily wages (C.I.) |
No. of workers (fi) |
Class-Mark (xi) |
fi xi |
|
100 - 120 |
12 |
110 |
1320 |
|
120 - 140 |
14 |
130 |
1820 |
|
140 - 160 |
8 |
150 |
1200 |
|
160 - 180 |
6 |
170 |
1020 |
|
180 - 200 |
10 |
190 |
1900 |
|
Σfi = 50 |
Σfi xi = 7260 |
Solution not provided.
Ans. 45 Marks
The marks obtained by 40 students of class X of a certain school in Science paper consisting of 10 marks are presented in the table below. Find the mean marks obtained by the students.
|
Marks obtained(xi) |
5 |
6 |
7 |
8 |
9 |
|
Number of students (fi) |
4 |
8 |
14 |
11 |
3 |
|
Marks Obtained (xi) |
Number of students (fi) |
fixi |
|
5 |
4 |
20 |
|
6 |
8 |
48 |
|
7 |
14 |
98 |
|
8 |
11 |
88 |
|
9 |
3 |
27 |
|
Σfi = 40 |
Σfixi = 281 |
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