## Andhra Pradesh Board Class 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Textbooks Solutions PDF

Andhra Pradesh State Board STD 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 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 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Books Answers Solutions, then you are in the right place. Here is a complete hub of Andhra Pradesh State Board Class 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 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 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Textbooks. These Andhra Pradesh State Board Class 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 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 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Books Solutions

Board | AP Board |

Materials | Textbook Solutions/Guide |

Format | DOC/PDF |

Class | 8th |

Subject | Maths |

Chapters | Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 |

Provider | Hsslive |

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## AP Board Class 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Textbooks Solutions with Answer PDF Download

Find below the list of all AP Board Class 8th Maths Chapter 7 Frequency Distribution Tables and Graphs Ex 7.1 Textbook Solutions for PDF’s for you to download and prepare for the upcoming exams:Question 1.

Find the arithmetic mean of the sales per day in a fair price shop in a week.

₹ 10000, ₹ 10250, ₹ 10790, ₹ 9865, ₹ 15350, ₹ 10110

Solution:

Question 2.

Find the mean ofthe data; 10.25, 9, 4.75, 8, 2.65, 12, 2.35

Solution:

Question 3.

Mean of eight observations is 25. If one observation 11 is excluded, find the mean of the remaining.

Solution:

Given that

The mean of 8 observations = 25

The sum of 8 observations = 8 × 25

= 200

If the observation 11 is subtracted from the sum

⇒ 200 – 11 = 189

∴ The mean of remaining 7 observations = 1897 = 27

Question 4.

Arithmetic mean of nine observations is calculated as 38. But in doing so, an observation 27 is mistaken for 72. Find the actual mean of the data.

Solution:

The mean of 9 observations = 38

The sum of 9 observations = 38 × 9

= 342

If the observation 27 is mistaken for 72

then correct observation = 72 – 27

= 45

Sum of correct observations = 342 + 45

= 387

∴ Correct Mean = 3879 = 43

Question 5.

Five years ago mean age of a family was 25 years. What is the present mean age of the family ?

Solution:

When all the observations of the data are increased or decreased by a certain number, the mean also increases or decreases by the same number.

Five years ago mean age of a family = 25 years

Present mean age of the family = 25 + 5 = 30 y

Question 6.

Two years ago the mean age of 40 people was 11 years. Now a person left the group and the mean age is changed to 12 years. Find the age of the person who left the group.

Solution:

The present mean age of 40 people = 11 + 2 = 13 years

∴ The total age of 40 people = 40 × 13

= 520 years

If 1 person is left from the group of 40 people then remaining will be = 40 – 1 = 39.

The mean age of 39 people = 12 years

The total age of 39 people = 39 × 12

= 468 years

Age of the person who left from the group = 520 – 468 = 52 years

Question 7.

Find the sum of deviations of all observations of the data 5,8, 10, 15,22 from their mean.

Solution:

A.M. of the observations 5,8,10,15,22 is

∴ Sum of deviations = 0

Question 8.

If sum of the 20 deviations from the mean is 100, then find the mean deviation.

Solution:

Question 9.

Marks of 12 students inaunittestare givenas4,21, 13, 17,5,9, 10,20, 19, 12,20, 14.

Assume a mean and calculate the arithmetic mean of the data. Assume another number as

mean and calculate the arithmetic mean again. Do you get the same result? Comment.

Solution:

Given observations are 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14

Estimated mean = 10 say

A.M. Estimated Mean + Average of deviations

= 10 + 4412 = 10 + 3.67 = 13.67

∴ A.M = 𝑥¯ = 13.67

Another Estimated Mean = 12 then

𝑥¯ = A.M. = Estimated Mean + Average of deviations

= 12 + 2012 = 12 + 1.67 = 13.67

𝑥¯ = 13.67

∴ In all cases 𝑥¯ = 13.67

Question 10.

Arithmetic mean of marks (out of 25) scored by 10 students was 15. One of the student, named Karishma enquired the other 9 students and find the deviations from her marks are noted as – 8, – 6, – 3, – 1, 0, 2, 3,4, 6. Find Karishma’s marks.

Solution:

Average marks of 10 students = 15

Total marks of 10 students = 10 × 15

= 150

Marks obtained by Karishma = x say

Deviations of 9 students =

-8, -6-3,-1,0, 2, 3,4,6

∴ x-8 + x-6 + x-3 + x-l + x + x + 2 + x + 3 + x + 4 + x + 6 + x = 150

⇒ 10x- 3 = 150

⇒ 10x = 150 + 3 = 153

x = 15310 = 15.3

(Or)

The given observations are

-8,-6,-3,-1,0, 2, 3, 4,6

Let the number of marks of Karisima =

Her deviation from x’ are – 8 + x, – 6 + x, – 3 + x, – 1 + x, x + 0, 2 + x, 3 + x, 4 + x, 6 + x

[ ∵ Mean = 15 is given]

10x – 3 = 15 × 10

10x =150 + 3

10x= 153

x = 15310

x = 15.3

∴ Number of marks obtained by Karishma = 15.3

Question 11.

The sum of deviations of ‘n’ observations from 25 is 25 and sum of deviations of the same ‘n’ observations from 35 is – 25. Find the mean of the observations.

Solution:

From the value ’25’ the sum of deviations of a data = Σx_{1} = 25

∴ Mean of the observation = 25 + Σx1n

= 25+25𝑛=25𝑛+25𝑛

From the value ’35’ the sum of deviations of a data = Σx_{1} = -25

∴ Mean of the observation = 35 + Σx1n

= 35+−25𝑛=35𝑛+25𝑛

Mean of the given data

(Or)

Let x_{1}, x_{2}, x_{3},…… x_{n} are the number of

deviations from 25

∴ Number of observations are

x_{1} – 25, x_{2} – 25, …………. x_{n} – 25

∴ Sum of the observations = 25

∴ x_{1} – 25 + x_{2} – 25 +…………. + x_{n} – 25 = 25

⇒ x_{1}+ x_{2} + + x_{n} = 25 + 25n …………(1)

= 25 (n + 1)

Deviations from 35 are

x_{1} – 35, x_{2} – 35y …………., x_{n} – 35

∴ Sum of the deviations = – 25

∴ (x_{1} – 35) + (x_{2} – 35) + … (x_{n} – 35) = – 25

⇒x_{1} + x_{1} +………………….. + x_{n} = – 25 + 35 x n …………….(2)

From (1) and (2),

– 25 + 35n = 25 + 25n

⇒ 10n = 50

n = 5

∴ Mean of the observations

Question 12.

Find the median of the data ; 3.3, 3.5, 3.1, 3.7, 3.2, 3.8

Solution:

The ascending order of 3.3, 3.5, 3.1, 3.7, 3.2, 3.8 is 3.1, 3.2, 3.3, 3.5, 3.7, 3.8

∴ n = 6 (is an even)

Median = Mean of 𝑛2,(𝑛2+1) terms

= 62,([𝑙𝑎𝑡𝑒𝑥]62 + 1)[/latex]

= Mean of 3, 4 terms

= 3.3+3.52

= 6.82 = 3.4

Question 13.

The median of the following observations, arranged in ascending order is 15. 10, 12, 14, x – 3, x, x + 2, 25.Then find x.

Solution:

Given observations are

10, 12, 14, x – 3,x ; x + 2, 25

⇒ n = 7 (is an odd)

∴ Median = 𝑛+12=7+12 = 4th term

= x – 3

⇒ x-3 = 15

⇒ x = 15 + 3

∴ x = 18

Question 14.

Find the mode of 10, 12, 11, 10, 15, 20, 19, 21, 11, 9, 10

Solution:

The given observations are

10, 12, 11, 10, 15, 20, 19,21,11,9, 10

∴ The most frequently occurring observation is 10.

∴ Mode = 10

Question 15.

Mode of certain scores is x. 1f each score is decreased by 3, then find the mode of the new series.

Solution:

The mode of some observations is ‘x’. If ‘3’ is subtracted from every observa¬tion then the mode = x – 3

Question 16.

Find the mode of all digits used in Titing the natural numbers from 1 to 100.

Solution:

Natural numbers from 1 to 100 are 1,2,3, …………….99, 100

∴ It has no mode.

[ ∵ Every number appears only once]

Question 17.

Observations of a raw data are 5, 28, 15, 10, 15, 8, 24. Add four more numbers so that mean and median of the data remain the same, but mode increases by 1.

Solution:

The given observations are 5, 28, 15, 10, 15, 8, 24

Ascending order of the observations 5, 8, 10, 15, 15, 24, 28

Median = 𝑛+12=7+12 = 4 th term

= 15 [n = 7 is an odd]

∴ Mode = 15

If 4 observations are inserted for the given data then mode increases by 1.

Let x_{1} = x_{2} = x_{3} = x say .

∴ The mean

= 𝑥+𝑥+𝑥+𝑥4+1011 = 15

⇒ 3x + x_{4} = 165 – 105 = 60

∴ 3x + x_{4} = 60

If mode will increases by 1 then

x= 15 +1 = 16

∴ 3x + x_{4} = 60

⇒ 3 x 16 + x_{4} =60

⇒ x_{4} = 60 – 48 = 12

∴ The required 4 observations are 12, 16, 16, 16

Question 18.

If the mean of a set of observations x_{1}, x_{1} , x_{10} is 20. Find the mean of x_{1} + 4, x_{2} + 8, x_{3} + 12 , x_{10} + 40.

Solution:

Mean of observations x_{1}, x_{2}……………….. ,x_{10} is

= 20 + 2 × 11 = 20 + 22 = 42

Question 19.

Six numbers from a list of nine integers are 7,8,3, 5,9 and 5. Find the largest possible value of the median of all nine numbers in this list.

Solution:

The given 6 integers are 7, 8, 3, 5, 9, 5

Ascending order = 3, 5, 5, 7, 8, 9

Let the remaining 3 observations be x_{1}, x_{2}, x_{3} say

Median of 3, 5, 5, 7, 8, 9, x_{1}, x_{2}, x_{3} is

= 𝑛+12 [ ∵ n is an odd (9)]

= 9+12 = 5th term = 8

∴ The largest possible median will be 8

Question 20.

The median of a set of 9 distinct observations is 20. If each of the largest 4 observations of the set is increased by 2, find the median of the resulting set.

Solution:

Let the 9 observations be x_{1}, x_{2}………..x_{9} say

Median = 𝑛+12 [∵ n = 9 is an odd]

= 𝑛+12 = 5th term = x_{5} = 20

∴ x_{5} = 20

If 2 is added to the last 4 largest numbers then x_{1}, x_{2}, x_{3}, x_{4}, x_{5}, x_{6} + 2 x_{7} + 2, x_{8} + 2, x_{9} +2

∴ Median = 𝑛+12=9+12 = 5th term

∴ x_{5} = 20

## AP Board Textbook Solutions PDF for Class 8th Maths

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- AP Board Class 8 Maths Chapter 11 బీజీయ సమాసాలు InText Questions Textbook Solutions PDF
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- AP Board Class 8 Maths Chapter 12 కారణాంక విభజన Ex 12.2 Textbook Solutions PDF
- AP Board Class 8 Maths Chapter 12 కారణాంక విభజన Ex 12.3 Textbook Solutions PDF
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- AP Board Class 8 Maths Chapter 15 సంఖ్యలతో ఆడుకుందాం Ex 15.4 Textbook Solutions PDF
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