Short Answer TypeIn the following distribution frequency of the class-interval 40-50 and 70-80 are missing. If the mean of the distribution is 52. Find the missing frequencies.
|
Wages (Rs.) |
Number of workers |
|
10-20 |
5 |
|
20-30 |
3 |
|
30-40 |
4 |
|
40-50 |
- |
|
50-60 |
2 |
|
60-70 |
6 |
|
70-80 |
- |
|
Total |
4 |
The mean of the following data is 38.7. Find the missing frequencies f1 and f2.
|
Classes |
Frequencies |
|
0-10 |
5 |
|
10-20 |
7 |
|
20-30 |
f1 |
|
30-40 |
3 |
|
40-50 |
f2 |
|
50-60 |
9 |
|
60-70 |
6 |
|
Total |
100 |
Find the mean marks of the following data :
|
Marks |
Number of students |
|
Below 20 |
15 |
|
Below 40 |
31 |
|
Below 60 |
55 |
|
Below 80 |
70 |
|
Below 100 |
80 |
Find the mean marks from the following data :
|
Marks |
Number of students |
|
Below 10 |
4 |
|
Below 20 |
12 |
|
Below 30 |
22 |
|
Below 40 |
34 |
|
Below 50 |
48 |
|
Below 60 |
64 |
|
Below 70 |
78 |
|
Below 80 |
87 |
|
Below 90 |
92 |
|
Below 100 |
100 |
Find the mean of following cumulative frequency distribution:
|
Marks |
Number of observations |
|
less than 10 |
0 |
|
less than 15 |
5 |
|
less than 20 |
11 |
|
less than 25 |
19 |
|
less than 30 |
31 |
|
less than 35 |
37 |
|
less than 40 |
40 |
Find the mean marks of students from the following frequency table.
|
Marks |
Number of students |
|
0 and above |
100 |
|
10 and above |
88 |
|
20 and above |
80 |
|
30 and above |
68 |
|
40 and above |
54 |
|
50 and above |
44 |
|
60 and above |
36 |
|
70 and above |
34 |
|
80 and above |
21 |
|
90 and above |
9 |
|
100 and above |
0 |
Solution not provided.
Ans. 48.4
Find the mean of following cumulative frequency distribution.
|
Marks |
Number of observations |
|
10 and above |
100 |
|
20 and above |
89 |
|
30 and above |
74 |
|
40 and above |
54 |
|
50 and above |
24 |
|
60 and above |
10 |
|
70 and above |
0 |
Find the mean marks of students from the following cumulative frequency distribution.
|
Marks |
Number of students |
|
0 and above |
80 |
|
10 and above |
77 |
|
20 and above |
72 |
|
30 and above |
65 |
|
40 and above |
55 |
|
50 and above |
43 |
|
60 and above |
28 |
|
70 and above |
16 |
|
80 and above |
10 |
|
90 and above |
8 |
|
100 and above |
0 |
The follwowing table shown the weekly wages drawn by number of workers in a factory.
|
Weekly wages (Rs) |
Number of workers |
|
0-100 |
40 |
|
100-200 |
39 |
|
200-300 |
34 |
|
300-400 |
30 |
|
400-500 |
45 |
Find the median wage income of the workers.
Complete the median for the following cumulative frequency distribution.
|
Less than 10 |
0 |
|
Less than 15 |
4 |
|
Less than 20 |
16 |
|
Less than 25 |
30 |
|
Less than 30 |
46 |
|
Less than 35 |
66 |
|
Less than 40 |
82 |
|
Less than 90 |
92 |
|
Less than 100 |
100 |
Switch
