AP Board Class 9 Maths Chapter 9 Statistics Ex 9.2 Textbook Solutions PDF: Download Andhra Pradesh Board STD 9th Maths Chapter 9 Statistics Ex 9.2 Book Answers ~ HSSlive: Plus One & Plus Two Notes & Solutions for Kerala State Board

AP Board Class 9 Maths Chapter 9 Statistics Ex 9.2 Textbook Solutions PDF: Download Andhra Pradesh Board STD 9th Maths Chapter 9 Statistics Ex 9.2 Book Answers

AP Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks Solutions and answers for students are now available in pdf format. Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Book answers and solutions are one of the most important study materials for any student. The Andhra Pradesh State Board Class 9th Maths Chapter 9 Statistics Ex 9.2 books are published by the Andhra Pradesh Board Publishers. These Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 textbooks are prepared by a group of expert faculty members. Students can download these AP Board STD 9th Maths Chapter 9 Statistics Ex 9.2 book solutions pdf online from this page.

Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks Solutions PDF

Andhra Pradesh State Board STD 9th Maths Chapter 9 Statistics Ex 9.2 Books Solutions with Answers are prepared and published by the Andhra Pradesh Board Publishers. It is an autonomous organization to advise and assist qualitative improvements in school education. If you are in search of AP Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Books Answers Solutions, then you are in the right place. Here is a complete hub of Andhra Pradesh State Board Class 9th Maths Chapter 9 Statistics Ex 9.2 solutions that are available here for free PDF downloads to help students for their adequate preparation. You can find all the subjects of Andhra Pradesh Board STD 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks. These Andhra Pradesh State Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks Solutions English PDF will be helpful for effective education, and a maximum number of questions in exams are chosen from Andhra Pradesh Board.

Andhra Pradesh State Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Books Solutions

Board	AP Board
Materials	Textbook Solutions/Guide
Format	DOC/PDF
Class	9th
Subject	Maths
Chapters	Maths Chapter 9 Statistics Ex 9.2
Provider	Hsslive

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AP Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks Solutions with Answer PDF Download

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AP State Syllabus 9th Class Maths Solutions 9th Lesson Statistics Exercise 9.2

Question 1.
Weights of parcels in a transport office are given below.

Find the mean weight of the parcels.
Solution:

Weight in kg x_i	No. of parcels f_i	x₁f_i
50	25	1250
65	34	2210
75	38	2850
90	40	3600
110	47	5170
120	16	1920

Σf_i = 200
Σf_ix_i = 17000
x⎯⎯⎯=ΣfixiΣfi=17000200=1702x⎯⎯⎯=85
Mean = 85

Question 2.
Number of familles In a village in correspondence with the number of children are given below.

Find the mean number of children per family.
Solution:

No. of childrens x_i	No. of families f_i	x₁f_i
0	11	0
1	25	25
2	32	64
3	10	30
4	5	20
6	1	5

Σf_i = 84
Σf_ix_i = 144
x⎯⎯⎯=ΣfixiΣfi=14484
Mean = 1.714285

Question 3.
If the mean of the following frequency distribution is 7.2, find value of ‘k’.

Solution:

Σf_i = 40 + k;
Σf_ix_i = 260 + 10k
Given that x⎯⎯⎯ = 7.2
But x⎯⎯⎯=Σf1xiΣfi
7.2 = 260+10𝑘40+𝑘
288.0 + 7.2k = 260 + 10k
10k – 7.2k = 288 – 260
2.8k = 28
k = 282.8 = 10

Question 4.
Number of villages with respect to their population as per India census 2011 are given below.

Find the average population in each village.
Solution:

Population (in thousands x_i)	Villages f_i	x₁f_i
12	20	240
5	15	75
30	32	960
20	35	700
15	36	540
8	7	56

Σf_i = 145 Σf_ix_i = 2571 thousands
x⎯⎯⎯=ΣfixiΣfi
Mean = 2571145 = 17.731 thousands

Question 5.
A FLATOUN social and financial educational programme initiated savings programme among the high school children in Hyderabad district. Mandal wise savings in a month are given in the following table.

Mandal	No. of schools	Total amount saved (in rupees
Amberpet	6	2154
Thirumalgiri	6	2478
Saidabad	5	975
Khairathabad	4	912
Secunderabad	3	600
Bahadurpura	9	7533

Find arithmetic mean of school wise savings in each mandal. Also find the arithmetic mean of saving of all schools.
Solution:

Σf_i = 33
Σf_ix_i = 14652
Mean = ΣfixiΣfi
𝑥¯=1465233 = ₹ 444 (Mean savings per school)

Question 6.
The heights of boys and girls of IX class of a school are given below.

Compare the heights of the boys and girls.
[Hint: Fliid median heights of boys and girls]
Solution:

Boys median class=37+12=382= 19th observation
∴ Median height of boys = 147 cm
Girls median class= 29+12=302 = 15th observation
∴ Median height of girls = 152 cm

Question 7.
Centuries scored and number of cricketers in the world are given below.

Find the mean, median and mode of the given data.
Solution:

Question 8.
On the occasion of New year’s day a sweet stall prepared sweet packets. Number of sweet packets and cost of each packet is given as follows

Find the mean, median and mode of the given data.
Solution:

N = Σf_i = 150
Σf_ix_i = 12000
Mean = x⎯⎯⎯=ΣfixiΣfi=12000150=80
Median = average of (𝑁2+1 and 𝑁2 terms = average of 75 and 76 observation = 75
Mode = 50

Question 9.
The mean (average) weight of three students is 40 kg. One of the students Ranga weighs 46 kg. The other two students, Rahim and Reshma have the same weight.
Find Rahim’s weight. cgigB)
Solution:
Weight of Ranga = 46 kg
Weight of Reshma = Weight of Rahim = x kg say
Average = Sum of the weights Number = 40kg
∴ 40 = 46+𝑥+𝑥3
3 x 40 = 46 + 2x
2x = 120 – 46 = 74
∴ x = 742 = 37 .
∴ Rahim’s weight = 37 kg.

Question 10.
The donations given to an orphanage home by the students of different classes of a secondary school are given below.

Class	Donation by each student in (Rs)	No. of students donated
VI	5	15
VII	7	15
VIII	10	20
IX	15	16
X	20	14

Find the mean, median and mode of the data.
Solution:

Σf_i = 80
Σf_ix_i = 900
Mean x⎯⎯⎯=ΣfixiΣfi=90080=11.25
Median = Average of (N2) and (N2+1) terms of 802,(802+1) terms
= average of 40 and 41 terms = ₹10
Mode = ₹ 10

Question 11.
There are four unknown numbers. The mean of the first two numbers is 4 and the mean of the first three is 9. The mean of all four numbers is 15; if one of the four numbers is 2 find the other numbers.
Solution:
We know that mean = sum number
Given that, Mean of 4 numbers = 15
⇒ Sum of the 4 numbers = 4 x 15 = 60
Mean of the first 3 numbers = 9
⇒ Sum of the first 3 numbers = 3 x 9 = 27
Mean of the first 2 numbers = 4
⇒ Sum of the first 2 numbers = 2 x 4 = 8
Fourth number = sum of 4 numbers – sum of 3 numbers = 60 – 27 = 33
Third number = sum of 3 numbers – sum of 2 numbers = 27 – 8 = 19
Second number = Sum of 2 numbers – given number = 8-2 = 6
∴ The other three numbers are 6, 19, 33.

AP Board Textbook Solutions PDF for Class 9th Telugu

Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks for Exam Preparations

Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 Textbook Solutions can be of great help in your Andhra Pradesh Board Class 9th Maths Chapter 9 Statistics Ex 9.2 exam preparation. The AP Board STD 9th Maths Chapter 9 Statistics Ex 9.2 Textbooks study material, used with the English medium textbooks, can help you complete the entire Class 9th Maths Chapter 9 Statistics Ex 9.2 Books State Board syllabus with maximum efficiency.

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