RBSE Solutions for Class 9 Maths Chapter 15 Statistics Ex 15.4

RBSE Solutions for Class 9 Maths Chapter 15 Statistics Ex 15.4 is part of RBSE Solutions for Class 9 Maths. Here we have given Rajasthan Board RBSE Class 9 Maths Solutions Chapter 15 Statistics Exercise 15.4.

Rajasthan Board RBSE Class 9 Maths Solutions Chapter 15 Statistics Ex 15.4

Question 1.
The following number of goals were scored by (RBSESolutions.com) a football 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.
The number of goals scored by a football team in a series of 10 matches are as under 2, 3, 4, 5, 0, 1, 3, 3, 4, 3
(i) Mean

(ii) Median: Arranging the given data (RBSESolutions.com) in ascending order, we have 0, 1, 2, 3, 3, 3, 3, 4, 4, 5
Here, n = 10 which is even, so there will be two median class

(iii) Mode: The number 3 occurs most frequently in the data i.e. 4 times. Hence, Mode = 3

Question 2.
In a Mathematics test given by 15 students, the (RBSESolutions.com) 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 these data.
Solution:
(i) Mean

Hence, mean of the given data is 54.8.
(ii) Median: Arranging the given data (RBSESolutions.com) in the ascending order,
we have 39, 40, 40, 41, 42, 46, 48, 52, 52, 52, 54, 60, 62, 96, 98
Here, n = 15 which is odd, so their will be only one median class

(iii) Here, the mark 52 occurred most frequently i.e. 3 times.
Hence, Mode = 52.

Question 3.
The following observations have been arranged (RBSESolutions.com) 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:
Here, number of observations = 10 (even)

Question 4.
Find the mode of 14, 25, 14, 28, 18, 17, 18, 14, 23, 22, 14, 18.
Solution.
We find that the observation 14 occurs frequently maximum number of times i.e. 4 times. Hence, mode is 14.

Question 5.
Find the mean salary of 60 workers of (RBSESolutions.com) a factory from the following table:

Solution.
Here, we will find mean salary of 60 workers of a factory by direct method.

Hence, mean salary of 60 workers of (RBSESolutions.com) a factory is Rs 5083.33.

We hope the given RBSE Solutions for Class 9 Maths Chapter 15 Statistics Ex 15.4 will help you. If you have any query regarding RBSE Rajasthan Board Solutions for Class 9 Maths Chapter 15 Statistics Ex 15.4, drop a comment below and we will get back to you at the earliest.