CG SCERT (Chhattisgarh Board) Class 8 Mathematics Solutions | 2026-27 Official Edition
Complete 100% textbook-grounded CG Board Class 8 Mathematics Chapter 6 Solutions: Statistics (सांख्यिकी) in Bilingual Format (English & Hindi Medium).
Question 1
Find the mean 81 74 69 73 91…
माध्य ज्ञात कीजिए 81 74 69 73 91…
📝 Question:
Find the mean: 81, 74, 69, 73, 91, 55, 61
💡 Solution:
Mean =)/)
- Sum of observations / = 81 + 74 + 69 + 73 + 91 + 55 + 61 = 504
- Number of observations (N) / = 7
- Mean = 504/7 = 72
Question 2
Find the mean of the even numbers between…
50 से 70 के बीच की सम संख्याओं…
📝 Question:
Find the mean of the even numbers between 50 and 70
💡 Solution:
- Even numbers between 50 and 70 / 50 70
52, 54, 56, 58, 60, 62, 64, 66, 68
- Sum of these numbers / = 52 + 54 + 56 + 58 + 60 + 62 + 64 + 66 + 68 = 540
- Total count of numbers (N) / = 9
- Mean = 540/9 = 60
Question 3
Find the median 4 5 10 6 7…
माध्यिका ज्ञात कीजिए 4 5 10 6 7…
📝 Question:
Find the median: 4, 5, 10, 6, 7, 14, 9, 15
💡 Solution:
- Arranging the data in ascending order /
4, 5, 6, 7, 9, 10, 14, 15
- Here, number of terms N = 8.
- Formula for Even N / :
Median = ((N/2)th term + (N/2 + 1)th term)/(2)
- N/2th term = 4th term = 7
- (N/2 + 1)th term = 5th term = 9
- Median = (7 + 9)/(2) = 16/2 = 8
Question 4
The weight of 11 students in kgs in…
एक कक्षा के 11 विद्यार्थियों का भार किग्रा…
📝 Question:
The weight of 11 students (in kgs) in a class are as follows: 25, 27, 29, 32, 30, 28, 26, 31, 35, 41, 34. Find its median
💡 Solution:
- Arranging weights in ascending order /
25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 41
- Here, number of terms N = 11.
- Formula for Odd N / :
Median = ((N + 1)/(2))th term
- Median = ((11 + 1)/(2))th term = 6th term
- The 6th term is 30 kg.
Question 5
In a Science quiz competition one student of…
एक विज्ञान प्रश्नोत्तरी प्रतियोगिता में कक्षा 8वीं के…
📝 Question:
In a Science quiz competition, one student of class VIII received the following marks: 83, 61, 48, 73, 76, 52, 67, 61, 79. Find the median of the above marks
💡 Solution:
- Arranging marks in ascending order /
48, 52, 61, 61, 67, 73, 76, 79, 83
- Here, number of terms N = 9.
- Median = ((9 + 1)/(2))th term = 5th term
- The 5th term is 67.
Question 6
Find the mode of the given data 7…
दिए गए आंकड़ों का बहुलक ज्ञात कीजिए 7…
📝 Question:
Find the mode of the given data: 7, 5, 99, 3, 1, 9, 7, 5, 3, 1, 1, 9, 7, 7, 5, 5, 5, 3, 1, 5, 3, 5, 1, 5, 7, 7, 9, 9, 1
💡 Solution:
- Mode is the value that occurs most frequently in the given data.
- Frequency Table / :
- Number 1 occurs 6 times
- Number 3 occurs 4 times
- Number 5 occurs 8 times
- Number 7 occurs 6 times
- Number 9 occurs 4 times
- Number 99 occurs 1 time
- Since 5 has the maximum frequency (8 times), the Mode = 5. , = 5 )*
Question 7
Find the mode of the given distribution 5…
दिए गए बंटन का बहुलक ज्ञात कीजिए 5…
📝 Question:
Find the mode of the given distribution: 5, 3, 2, 2, 4, 5, 3, 3, 4, 3, 5, 3
💡 Solution:
- Frequency of numbers / :
- 2 appears 2 times
- 3 appears 5 times
- 4 appears 2 times
- 5 appears 3 times
- Number 3 has the highest frequency (5 times). So, Mode = 3. = 3 )*
Question 8
Find the mean of the first five odd…
प्रथम पाँच विषम प्राकृत संख्याओं का माध्य ज्ञात…
📝 Question:
Find the mean of the first five odd natural numbers
💡 Solution:
- First five odd natural numbers /
1, 3, 5, 7, 9
- Sum / = 1 + 3 + 5 + 7 + 9 = 25
- Count (N) / = 5
- Mean = 25/5 = 5
Question 9
The mean of the numbers 8 5 x…
संख्याओं 8 5 x 6 10 5 का…
📝 Question:
The mean of the numbers 8, 5, x, 6, 10, 5 is 7. Find the value of x
💡 Solution:
- Given Mean / = 7
- Sum of observations / = 8 + 5 + x + 6 + 10 + 5 = 34 + x
- Number of observations / = 6
- Using Formula / :
Mean = (Sum)/(Count)
7 = (34 + x)/(6)
7 × 6 = 34 + x
42 = 34 + x
x = 42 – 34 = 8
### *EXERCISE 6.2
Question 1
The marks obtained by Geeta in the monthly…
गणित के मासिक टेस्ट में गीता द्वारा 6…
📝 Question:
The marks obtained by Geeta in the monthly test exams in mathematics for 6 months are as follows: July: 40, August: 45, September: 65, October: 35, Nov.: 55, Dec.: 60 (Out of 100). Construct a pi-chart with the help of the above data. Step-by-Step Calculation of Central Angles / : Total Marks Obtained / = 40 + 45 + 65 + 35 + 55 + 60 = 300 Total Central Angle of a circle / = 360° Formula / : Central Angle = (Marks Obtained)/(Total Marks) × 360°| Month | Marks | Central Angle Calculation | Central Angle | | :— | :—: | :—: | :—: | | July | 40 | 40/300 × 360°| 48° | | August | 45 | 45/300 × 360°| 54° | | September | 65 | 65/300 × 360°| 78° | | October | 35 | 35/300 × 360°| 42° | | November | 55 | 55/300 × 360°| 66° | | December | 60 | 60/300 × 360°| 72° | | Total* | 300 | | 360° |
💡 Solution:
- Draw a circle of any convenient radius.
- Draw a radius as a starting base line.
- Construct sectors corresponding to angles 48°, 54°, 78°, 42°, 66°, and 72°sequentially using a protractor.
- Label each sector with the respective month name and marks.
Question 2
The monthly income of a family is Rs…
एक परिवार की मासिक आय रु 1200000 है।…
📝 Question:
The monthly income of a family is Rs. 12,000.00. The expenditure of the family in the month is as follows: House rent: Rs. 1500, Food: Rs. 6000, Education: Rs. 2200, Entertainment: Rs. 800, Health: Rs. 1500. Make a pi-chart of the given data. Step-by-Step Calculation of Central Angles / : Total Monthly Income / = Rs. 12,000 * Total Expenditure / = 1500 + 6000 + 2200 + 800 + 1500 = Rs. 12,000
💡 Solution:
| *House Rent | 1500 | (1500)/(12000) × 360° | 45° |
|---|---|---|---|
| *Education | 2200 | (2200)/(12000) × 360° | 66° |
| *Entertainment | 800 | (800)/(12000) × 360° | 24° |
| *Health | 1500 | (1500)/(12000) × 360° | 45° |
| *Total | 12000 | 360° |
Central Angle = (Expenditure)/(Total Income) × 360°| Item | Expenditure in Rs. | Central Angle Calculation | Central Angle |
- Draw a circle of convenient radius.
- Using a protractor, draw central angles of 45°(House rent), 180°(Food), 66°(Education), 24°(Entertainment), and 45°(Health)., 180°, 66°, 24° 45° )*
- Color/shade each sector appropriately to complete the pi-chart.
### *EXERCISE 6.3
Question 1
What will be the probability of drawing a…
ताश की गड्डी में से ईंट का पत्ता…
📝 Question:
What will be the probability of drawing a card of diamond from a pack of cards?
💡 Solution:
- Total number of cards in a pack / = 52
- Number of diamond cards / = 13
Probability =)/)
- Probability = 13/52 = 1/4
Question 2
A bag has 6 white 11 red 7…
एक थैले में 6 सफेद 11 लाल और…
📝 Question:
A bag has 6 white, 11 red & 7 blue balls. Find out the probability of drawing a white ball out of that bag?
💡 Solution:
- Total number of balls / = 6 + 11 + 7 = 24
- Number of white balls / = 6
- Probability of drawing a white ball = 6/24 = 1/4
Question 3
A horse race competition has five competitors Find…
एक घुड़दौड़ प्रतियोगिता में पाँच प्रतियोगी हैं। उनके…
📝 Question:
A horse race competition has five competitors. Find out their possibility of winning the race
💡 Solution:
- Total competitors / = 5
- Favorable outcome for one competitor to win / = 1
- Probability of winning = 1/5
Question 4
In a basket there are 10 apples 8…
एक टोकरी में 10 सेब 8 अनार और…
📝 Question:
In a basket there are 10 apples, 8 pomegranates (Anar) and 12 guavas. What will be the probability of taking out apples from the basket?
💡 Solution:
- Total number of fruits / = 10 + 8 + 12 = 30
- Number of apples / = 10
- Probability of drawing an apple = 10/30 = 1/3
Question 5
Find out the probability of appearance of an…
एक पासे को फेंकने पर सम संख्या आने…
📝 Question:
Find out the probability of appearance of an even number when a die is rolled
💡 Solution:
- Total outcomes on rolling a die / = {1, 2, 3, 4, 5, 6} ⇒ 6
- Even numbers / = {2, 4, 6} ⇒ 3
- Probability of an even number = 3/6 = 1/2
Question 6
On tossing a coin what will be the…
एक सिक्का उछालने पर चित् Head आने और…
📝 Question:
On tossing a coin, what will be the possibility of appearance of head and the appearance of tail for that coin?
💡 Solution:
- Total outcomes on tossing a coin / = 2
- Favorable outcome for Head / = 1
- Favorable outcome for Tail / = 1
- Probability of Head = 1/2
- Probability of Tail = 1/2