Short Answer TypeIf the median of following frequency distribution is 46, find the missing frequencies.
|
Variable |
Frequency |
|
10-20 |
12 |
|
20-30 |
30 |
|
30-40 |
x |
|
40-50 |
65 |
|
50-60 |
y |
|
60-70 |
25 |
|
70-80 |
18 |
|
Total |
229 |
Find the median marks of the following data :
|
Marks |
No. of students |
|
More than 150 |
0 |
|
More than 140 |
12 |
|
More than 130 |
27 |
|
More than 120 |
60 |
|
More than 110 |
105 |
|
More than 100 |
124 |
|
More than 90 |
141 |
|
More than 80 |
150 |
Calculate the mode of the following table. (i)
|
Weight (in kg.) |
No. of students |
|
40-44 |
4 |
|
45-49 |
16 |
|
50-54 |
24 |
|
55-59 |
20 |
|
60-64 |
12 |
|
65-69 |
8 |
(ii)
|
Weight (in cm) |
No. of students |
|
160-162 |
15 |
|
163-165 |
118 |
|
166-168 |
142 |
|
169-171 |
127 |
|
172-174 |
18 |
Solution not provided.
Ans. (i) 52.83 (ii) 167.35
Find the mean of the following frequency distributions:
|
Class Interval |
Frequency |
|
10-30 |
90 |
|
30-50 |
20 |
|
50-70 |
30 |
|
70-90 |
20 |
|
90-110 |
40 |
Find the mean of the following data :
|
Class Interval |
Frequency |
|
50-60 |
8 |
|
60-70 |
6 |
|
70-80 |
12 |
|
80-90 |
11 |
|
90-100 |
13 |
The mean of the following frequency distribution is 62.8 and the sum of all frequencies is 50. Compute the missing frequencies f1 and f2 :
|
Class Interval |
Frequency |
|
0-20 |
5 |
|
20-40 |
f1 |
|
40-60 |
10 |
|
60-80 |
f2 |
|
80-100 |
7 |
|
100-120 |
8 |
|
Total |
50 |
The mean of the following frequency distribution is 57.6 and the sum of the observation is 50. Find the missing frequency f1 and f2.
|
Class Interval |
Frequency |
|
0-20 |
7 |
|
20-40 |
f1 |
|
40-60 |
12 |
|
60-80 |
f2 |
|
80-100 |
8 |
|
100-120 |
5 |
For what value of x the mode of the following data is 17.
15, 16, 17, 13, 17, 16, 14, x, 17, 16, 15, 15.
For what value of x the mode of the following data is 6.
13, 15, 16, 14, 16, 14, 13, 14, 13, x, 16, 17, 18, 17.
The following data have been arranged in ascending order:
12, 14, 17, 20, 22, x, 26, 28, 32, 36.
If the median of the data is 23, find x. Also in above data, if 32 is changed to 23, find the new median.
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