NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.4 are part of NCERT Solutions for Class 9 Maths. Here we have given NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.4.
- Statistics Class 9 Ex 14.1
- Statistics Class 9 Ex 14.2
- Statistics Class 9 Ex 14.3
- Statistics Class 9 Ex 14.4
Board | CBSE |
Textbook | NCERT |
Class | Class 9 |
Subject | Maths |
Chapter | Chapter 14 |
Chapter Name | Statistics |
Exercise | Ex 14.4 |
Number of Questions Solved | 6 |
Category | NCERT Solutions |
NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.4
Ex 14.4 Class 9 Maths Question 1.
The following number of goals were scored by a team in a series of 10 matches:
2,3, 4, 5, 0,1, 3, 3, 4, 3. Find the mean, median and mode of these scores.
Solution.
Ex 14.4 Class 9 Maths Question 2.
In a mathematics test given to 15 students, the following marks (out of 100) are recorded :
41, 39, 48, 52, 46, 62, 54, 40, 96, 52, 98, 40, 42, 52, 60 Find the mean, median and mode of this data.
Solution.
Ex 14.4 Class 9 Maths Question 3.
The following observations have been arranged in ascending order. If the median of the data is 63, find the value of x.29, 32, 48, 50, x,x + 2, 72, 78, 84,95
Solution.
Ex 14.4 Class 9 Maths Question 4.
Find the mode of 14, 25,14, 28, 18,17,18,14, 23, 22,14 and 18.
Solution.
The given data is, 14, 25, 14, 28, 18, 17, 18, 14, 23, 22, 14, 18 Arranging the data in ascending order, we have 14, 14, 14, 14, 17, 18, 18, 18, 22, 23, 25, 28
Here 14 occurs most frequently (4 times).
∴ Mode = 14
Ex 14.4 Class 9 Maths Question 5.
Find the mean salary of 60 workers of a factory from the following table:
Salary (in Rs.) | Number of workers |
3000 | 16 |
4000 | 12 |
5000 | 10 |
6000 | 8 |
7000 | 6 |
8000 | 4 |
9000 | 3 |
1000 | 1 |
Total | 60 |
Solution.
Salary (In Rs.) | Number of workers | f_{i}x_{i}_{ } |
3000 | 16 | 48000 |
4000 | 12 | 48000 |
5000 | 10 | 50000 |
6000 | 8 | 48000 |
7000 | 6 | 42000 |
8000 | 4 | 32000 |
9000 | 3 | 27000 |
1000 | 1 | 10000 |
Total | \(\sum _{ i=1 }^{ 8 }{ { f }_{ i }=60 } \) |
\(\sum _{ i=1 }^{ 8 }{ { f }_{ i }{ x }_{ i }=305000 } \) |
Ex 14.4 Class 9 Maths Question 6.
Give one example of a situation in which
(i) the mean is an appropriate measure of central tendency.
(ii) the mean is not an appropriate measure of central tendency but the median is an appropriate measure of central tendency.
Solution.
(i) Mean marks in a test in mathematics.
(ii) Average beauty
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