NCERT Solutions for Class 11 Maths Chapter 15 Statistics Ex 15.3

Get Free NCERT Solutions for Class 11 Maths Chapter 15 Statistics Ex 15.3 PDF in Hindi and English Medium. Statistics Class 11 Maths NCERT Solutions are extremely helpful while doing your homework. Statistics Ex 15.3 Class 11 Maths NCERT Solutions were prepared by Experienced LearnCBSE.in Teachers. Detailed answers of all the questions in Chapter 15 Class 11 Statistics Ex 15.3 provided in NCERT Textbook.

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NCERT Solutions for Class 11 Maths Chapter 15 Ex 15.3

Question 1.
From the data given below state which group is more variable, A or B?

Solution:
For Group A :

Question 2.
From the prices of shares X and Y below, find out which is more stable in value:

Solution:

Question 3.
An analysis of monthly wages paid to workers in two firms A and B, belonging to the same industry, gives the following results:

(i) Which firm A or B pays larger amount as monthly wages?
(ii) Which firm, AorB, shows greater variability in individual wages?
Solution:
(i) Firm A :
Number of wage earners (n₁) = 586
Mean of monthly wages () = Rs.5253
∴ Total monthly wages = 5253 x 586
= Rs. 3078258
Firm B :
Number of wage earners (n₂) = 648
Mean of monthly wages () = Rs.5253
∴ Total monthly wages = 5253 x 648
= Rs. 3403944
Hence, Firm B pays larger amount as monthly wages.

(ii) Since both the firms have same mean of monthly wages, so the firm with greater variance will have more variability in individual wages. Thus firm B will have more variability in individual wages.

Question 4.
The following is the record of goals scored by team A in a football session:

For the team B, mean number of goals scored per match was 2 with a standard deviation 1.25 goals. Find which team may be considered more consistent?
Solution:
For team A:

Question 5.
The sum and sum of squares corresponding to length x (in cm) and weight y (in gm) of 50 plant products are given below:

Which is more varying, the length or weight?
Solution:

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