Practice Set 11.1 8th Std Maths Answers Chapter 11 Statistics
No. of saplings (Scores) xi | No. of students (frequency) fi | fi× xi |
1 | 4 | 4 |
2 | 6 | __ |
3 | 12 | __ |
4 | 8 | __ |
N = __ | ∑ fi× xi = __ |
No. of saplings (Scores) xi | No. of students (frequency) fi | fi× xi |
1 | 4 | 4 |
2 | 6 | 12 |
3 | 12 | 36 |
4 | 8 | 32 |
N = __ | ∑ fi× xi = 84
Question 2
Maharashtra Board Solution
The following table shows the electricity (in units) used by 25 families of Eklara village in a month of May. Complete the table and answer the following questions. |
Electricity used (Units) xi | No. of families (frequency) fi | fi× xi |
30 | 4 | |
45 | 6 | |
60 | 12 | |
75 | 8 | |
90 | 3 | |
N = __ | ∑ fi× xi = |
i. How many families use 45 units electricity?
ii. State the score, the frequency of which is 5.
iii. Find N, and ∑ fi× xi.
iv. Find the mean of electricity used by each family in the month of May.
Electricity used (Units) xi | No. of families (frequency) fi | fi× xi |
30 | 7 | 210 |
45 | 2 | 90 |
60 | 8 | 480 |
75 | 5 | 375 |
90 | 3 | 270 |
N = 25 | ∑ fi× xi = 1425 i. 2 families used 45 units of electricity.
Question 3
Maharashtra Board Solution
The number of members in the 40 families in Bhilar are as follows: 1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2,3, 5, 6, 4, 2. Prepare a frequency table and And the mean of members of 40 families.
Solution & Step-by-Step Answer:
∴ The mean of the members of 40 families is 3.9.
Question 4
Maharashtra Board Solution
The number of Science and Mathematics projects submitted by Model high school, Nandpur in last 20 years at the state level science exhibition is: 2, 3,4, 1, 2, 3, 1, 5, 4, 2, 3, 1, 3, 5, 4, 3, 2, 2, 3, 2. Prepare a frequency table and find the mean of the data.
Solution & Step-by-Step Answer:
∴ The mean of the given data is 2.75.
Maharashtra Board Class 8 Maths Chapter 11 Statistics Practice Set 11.1 Intext Questions and Activities
Question 1
Maharashtra Board Solution
The number of pages of a book Ninad read for five consecutive days were 60, 50, 54, 46, 50. Find the average number of pages he read everyday. (Textbook pg. no. 67)
Solution & Step-by-Step Answer:
∴ Average number of pages read daily is 52
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