Short Answer TypeThe marks obtained by 40 students of class-X of a certain school in Mathematics unit test consisting of 10 marks are presented in table below. Find the mean of the marks obtained by the students.
|
Marks obtained (xi) |
5 |
6 |
7 |
8 |
9 |
|
No. of students (fi) |
4 |
8 |
14 |
11 |
3 |
A survey was conducted by a group of persons as a part of energy consumption awareness in which they collected the following data regarding the number of electric summer cooler in 15 houses in a locality in North Delhi. Find the mean number of coolers per house.
|
No. of coolers |
0-2 |
2-4 |
4-6 |
6-8 |
8-10 |
|
No. of houses |
5 |
3 |
4 |
2 |
1 |
Which method do you use for finding the mean and why?
Consider the following distribution of daily wages of 100 workers in a jute Mill.
|
Daily wages (in Rs.) |
80-100 |
100-120 |
120-140 |
140-160 |
160-180 |
|
No. of workers |
40 |
20 |
15 |
15 |
10 |
Find the mean daily wages of the workers of the factory by using an appropriate method.
The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs. 7.5. Find the missing frequency f.
|
Daily Pocket allowance (in Rs.) |
2-4 |
4-6 |
6-8 |
8-10 |
10-12 |
12-14 |
|
No. of children |
6 |
8 |
15 |
f |
8 |
4 |
Solution not provided.
Ans. 3
If the mean of the following frequency distribution is 8. Find the value of p.
|
x |
3 |
5 |
7 |
9 |
11 |
13 |
|
f |
6 |
8 |
15 |
P |
8 |
4 |
If the mean of the following distribution is 6. Find the value of p.
|
x |
2 |
4 |
6 |
10 |
p + 5 |
|
f |
3 |
2 |
3 |
1 |
2 |
The data of number of patients attending a hospital in a month are given below. Find the average number of patients attending the hospital in a day.
|
No. of patients |
0-10 |
10-20 |
20-30 |
30-40 |
40-50 |
50-60 |
|
No. of days attending hospitals |
2 |
6 |
9 |
7 |
4 |
2 |
A student noted the number of cars passing through a spot on a road for 100 periods each of 3 minutes and summarised it in the table given below. Find the mode of the data.
|
No. of cars |
Frequency |
|
0-10 |
7 |
|
10-20 |
14 |
|
20-30 |
13 |
|
30-40 |
12 |
|
40-50 |
20 |
|
50-60 |
11 |
|
60-70 |
15 |
|
70-80 |
8 |
The given distribution shows the number of wickets taken by some top bowlers of the world in one day cricket matches.
|
Wickets taken |
No. of bowlers |
|
50-80 |
50 |
|
80-110 |
40 |
|
110-140 |
30 |
|
140-170 |
60 |
|
170-200 |
15 |
|
200-230 |
10 |
|
230-260 |
8 |
Find the mode of the data.
The following is the frequency distribution of marks obtained by class-X students of a school in CBSE BOARD EXAMINATION in Mathematics. Calculate the modal Marks.
|
Marks |
No. of Students |
|
40-50 |
20 |
|
50-60 |
15 |
|
60-70 |
30 |
|
70-80 |
12 |
|
80-90 |
15 |
|
90-100 |
8 |
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