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Chapter 14 : Statistic Answers
Revision
Maths Class X Chap-1 , Chap-2 ,Chap-3 ,Chap-4 , Chap-5 ,Chap-6 ,Chap-7 ,Chap-8 ,Chap-9 ,Chap-10 ,Chap-11 ,Chap-12 ,Chap-13 ,Chap-14, Chap-15
Chapter 14 : Statistic Answers
Revision
Class IX Chapter-14 Statistic
1a. The word “Data” is the plural form of the Latin
word
a) Dat
b) Date
c) Datum
d) Delta
2a. The branch of mathematics in which the extraction
of meaningful information from a given data is studied is known as
a) Algebra
b) Statistics
c) Trigonometry
d) Calculus
3a. Statistics deals with _______________ of data.
a) collection
b) organization
c) analysis
and interpretation
d) all
of the above
4a. The data which is collected for some purpose and is
collected by investigator himself/herself from the original source is known as
a) Elementary
data
b) Theoretical
data
c) Primary
data
d) Secondary
data
5a. The data which is collected from some other source,
already collected by someone else for some other purpose is known as
a) Elementary
data
b) Theoretical
data
c) Primary
data
d) Secondary
data
6a. An NGO collected data from different schools of an
area to know the number of student whose parent’s income is less than Rs.10000/month.
This data collected is
a) Elementary
data
b) Theoretical
data
c) Primary
data
d) Secondary
data
7a. The marks obtained by 15 students in a test are
given below
25, 10, 23, 25, 22, 10, 5, 23, 21, 15, 18, 25, 24, 20
, 19
The above data is
a) Summarized
data
b) Raw
data
c) Primary
data
d) Both
b and c
8a. Data that classify all observations in different
categories is known as __________ data.
a) Summarized
b) Raw
c) Primary
d) Both
b and c
9a. The original data that we get from an over speed
camera at a signal is
a) Summarized
b) Raw
c) Primary
d) Both
b and c
10a. The marks obtained by 10 students in a test are
given below
15 17 27
28 33 33 33 45
48 50
Find the range of the above data
a) 15
b) 31
c) 33
d) 35
11a. The marks obtained by 10 students in a test are
given below
15 33 27
28 33 17
33 22 19
50
Find the frequency of 33 marks in the above data.
a) 3
b) 4
c) 15
d) 50
12a. The number of times an observation occurs in a
given data is known as its
a) Class
b) Frequency
c) Amplitude
d) Interval
13a. Below is the table that shows the marks of 20
students in a class
Marks
|
Number of
students
|
10
|
5
|
15
|
3
|
20
|
8
|
22
|
2
|
25
|
2
|
Total
|
20
|
The above frequency distribution table is
a) Ungrouped
frequency distribution table
b) Grouped
frequency distribution table
c) Raw
data frequency distribution table
d) None
14a. Below is the table that shows the marks of 20
students in a class
Marks
|
Number of
students
|
0-5
|
5
|
6-10
|
4
|
11-15
|
1
|
16-20
|
8
|
21-25
|
2
|
Total
|
20
|
The above frequency distribution table is
a) Ungrouped
frequency distribution table
b) Grouped
frequency distribution table
c) Raw
data frequency distribution table
d) None
15a. Below is the table that shows the marks of 20
students in a class
Marks
|
Number of
students
|
0-5
|
5
|
6-10
|
4
|
11-15
|
1
|
16-20
|
8
|
21-25
|
2
|
Total
|
20
|
How many students got marks more than 10?
a) 1
b) 4
c) 10
d) 11
16a. Below is the table that shows the marks of 20
students in a class
Marks
|
Number of students
|
0-5
|
5
|
6-10
|
4
|
11-15
|
1
|
16-20
|
8
|
21-25
|
2
|
Total
|
20
|
How many
students got less than equal to 2o marks?
a) 8
b) 10
c) 18
d) 20
17a. The bar graph given below shows the number votes
received by the parties A, B, C, D, E, F and G in an election. The party which
got the second highest number of votes is
a) A
b) D
c) E
d) G
18a. The bar graph given below shows the number votes
received by the parties A, B, C, D, E, F and G in an election. By how much
number of votes the winning party exceeds the votes received by the party on
second number?
a) 1000
b) 2000
c) 4000
d) 6000
19a. Choose the incorrect option
a) Bars
graph is used to compare different categories of data
b) Histogram
uses bars to show the frequency of numerical data.
c) Histogram
makes comparison of discrete variables
d) Bar
graph makes comparison of discrete variables
20a.
The above graph is a
a) Histogram
b) Bar
graph
c) Frequency
graph
d) All
of the above
21a. In graph given in Q.20, find the number of
students whose weight is between 55 kg to 60 kg
a) 10
b) 8
c) 6
d) 4
22a. In graph given in Q.20, find the number of
students whose weight is between 55 kg to 65 kg
a) 18
b) 16
c) 14
d) 12
23a. A graph which shows the data by using vertical
bars of various heights to represent frequencies is known as
a) Bar
graph
b) Histogram
c) Both
of a & b
d) None
24a. The heights (in cm) of 11 students in a class are
as follows:
142 145 155 160 153 155 142 143 150 151 150
Find the median of this data
a) 149
b) 151
c) 150
d) 155
25a. The heights (in cm) of 11 students in a class are
as follows:
142 145 155 160 153 155 142 145 155 151 155
Find the mode of this data.
a) 149
b) 151
c) 150
d) 155
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Answers
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Chapter 14 : Statistic
Class X Chapter-14 Statistic
Class X Chapter-14 Statistic
1. The mean of 5 numbers was calculated as 25. Later
it was found that while calculating the mean one observation was mistakenly
considered as 50 instead of 75.Find the actual mean of the numbers.
a) 20
b) 25
c) 30
d) 35
2. Find the width of class interval from the table
showing marks obtained by the students in a class.
Marks Obtained
|
10-25
|
25-40
|
40-55
|
55-70
|
Number of students
|
5
|
10
|
12
|
13
|
a) 10
b) 15
c) 20
d) 25
3. Find the Class Mark of the class interval 10-25 the
table given in Q.2
a) 10
b) 17.5
c) 25
d) 32.5
4. Find the mean of the data from the table given
below.
Marks Obtained
|
25-50
|
50-75
|
Number of students
|
10
|
20
|
a) 54.17
b) 45.51
c) 37.25
d) 25.75
5. The value of the observation having the maximum
frequency in a given data is known as
a) Mean
b) Mode
c) Frequency
d) None
a) Mean
b) Mode
c) Frequency
d) None
6. If more than one value have the same maximum
frequency in a given data, the data is said to be
a) Grouped data
b) Ungrouped data
c) Multimodal
d) None
a) Grouped data
b) Ungrouped data
c) Multimodal
d) None
7. The number of absents in a month for 50 workers in a factory is
recorded as
No. of Absents
|
0
|
2
|
3
|
4
|
5
|
No. of workers
|
5
|
15
|
12
|
5
|
13
|
Find the mode of the data.
a) 2
b) 5
c) 13
d) 15
a) 2
b) 5
c) 13
d) 15
8. A survey conducted on 100 houses in a locality by a NGO resulted in
the following frequency table for the number of voters in a household.
No. of voters
|
1-3
|
3-5
|
5-7
|
7-9
|
9-11
|
No. of families
|
10
|
25
|
30
|
11
|
24
|
Find the modal class for the above frequency table.
a) 1-3
b) 3-5
c) 5-7
d) 7-9
a) 1-3
b) 3-5
c) 5-7
d) 7-9
9. Find the class size for the table given in Q.8
a) 1
b) 2
c) 3
d) 4
a) 1
b) 2
c) 3
d) 4
10. Find the mode of the data given in Q.8
a) 5.01
b) 5.25
c) 5.33
d) 5.42
a) 5.01
b) 5.25
c) 5.33
d) 5.42
11. for a given data
a) Mode is always less than Mean
b) Mean is always greater than Mode
c) Mode is always equal to mean
d) None of the above
a) Mode is always less than Mean
b) Mean is always greater than Mode
c) Mode is always equal to mean
d) None of the above
12. The principal ask the class teacher of a class to
given him average marks in mathematics obtained by most of the student in an
examination. The class teacher will provide him
a) Mean of the marks
b) Mode of the marks
c) Median of the marks
d) All of the above
a) Mean of the marks
b) Mode of the marks
c) Median of the marks
d) All of the above
13. The following data gives the information on the
observed lifetimes (in hours) of 200 LED bulbs
Life (in hours)
|
0-50
|
50-100
|
100-150
|
150-200
|
200-250
|
Frequency
|
10
|
25
|
75
|
60
|
30
|
Determine the modal lifetimes of the LED bulbs
a) 113.46 hours
b) 120.25 hours
c) 130.25 hours
d) 140.75 hours
a) 113.46 hours
b) 120.25 hours
c) 130.25 hours
d) 140.75 hours
14. The table below shows the marks obtained by the
students in mathematics.
Marks
Obtained
|
Number of
students
(Frequency)
|
20
|
5
|
25
|
11
|
30
|
25
|
45
|
8
|
60
|
18
|
Total
|
67
|
Find the median of the above data.
a) 20
b) 25
c) 30
d) 45
a) 20
b) 25
c) 30
d) 45
15. The table below shows the height of students in a
class.
Height of
student(cm)
|
Number of
students
(Frequency)
|
150
|
6
|
155
|
7
|
160
|
9
|
170
|
12
|
176
|
10
|
Total
|
44
|
Find the median of the above data.
a) 155
b) 160
c) 165
d) 170
a) 155
b) 160
c) 165
d) 170
16. Median marks obtained by the student is 40 means
that
a) 50% student obtained marks more than 40
b) 50% student obtained marks less than 40
c) 50% of marks are 40
d) 50% marks obtained less than 40 & 50% marks obtained more than 40
a) 50% student obtained marks more than 40
b) 50% student obtained marks less than 40
c) 50% of marks are 40
d) 50% marks obtained less than 40 & 50% marks obtained more than 40
17. There is a data showing salaries of 121 men in a
village. If the median salary is Rs.7500, how many men in the village have
salary less than Rs.7500?
a) 50
b) 51
c) 60
d) 61
a) 50
b) 51
c) 60
d) 61
18. There is a data showing marks of 40 students in
mathematics. If the median mark is 36, how many students have marks less than
Rs.7500?
a) 20
b) 21
c) 30
d) 40
a) 20
b) 21
c) 30
d) 40
19. The table below shows the marks obtained by the
students in mathematics.
Marks
Obtained
|
Number of
students
(Frequency)
|
20
|
5
|
25
|
11
|
30
|
25
|
45
|
8
|
60
|
18
|
Total
|
67
|
Find the number of students who got marks less than
30.
a) 11
b) 16
c) 25
d) 41
a) 11
b) 16
c) 25
d) 41
20. The table below shows the marks obtained by the
students in mathematics.
Marks
Obtained
|
Number of
students
(Frequency)
|
20
|
5
|
25
|
11
|
30
|
25
|
45
|
8
|
60
|
18
|
Total
|
67
|
Find the number of students who got marks greater than
equal to 45
a) 8
b) 18
c) 26
d) 67
a) 8
b) 18
c) 26
d) 67
21. The table below shows the height of students in a
class.
Height of
student(cm)
|
Number of
students
(Frequency)
|
140 - 145
|
6
|
145 - 150
|
7
|
150 - 155
|
15
|
155 - 160
|
12
|
160 -165
|
10
|
Total
|
50
|
Find the median class of the above data.
a) 140 - 145
b) 145 - 150
c) 150 - 155
d) 155 – 160
a) 140 - 145
b) 145 - 150
c) 150 - 155
d) 155 – 160
22. Find the median in Q21
a) 152
b) 154
c) 156
d) 158
a) 152
b) 154
c) 156
d) 158
23. The median of the following data is 167. Find the
values of x and y, if the total frequency is 30.
Class Intervals
|
Frequency
|
140 -150
|
5
|
150 -160
|
x
|
160 - 170
|
10
|
170 -180
|
8
|
180 -190
|
y
|
Total
|
30
|
a) x
=3 & y=4
b) x =4 & y=3
c) x =2 & y=5
d) x =5 & y=2
b) x =4 & y=3
c) x =2 & y=5
d) x =5 & y=2
24. Which of the following is the measure of central
tendency?
a) Mean
b) Median
c) Mode
d) All of the above
a) Mean
b) Median
c) Mode
d) All of the above
25. Choose the correct statement
a) Mode is the most commonly occurring value in a distribution
b) Mean is the middle value in the distribution when arranged either in ascending or aescending order
c) Mean is the sum of values of each observation divided by the number of observations.
d) All of the above
a) Mode is the most commonly occurring value in a distribution
b) Mean is the middle value in the distribution when arranged either in ascending or aescending order
c) Mean is the sum of values of each observation divided by the number of observations.
d) All of the above
Maths Class X Chap-1 , Chap-2 ,Chap-3 ,Chap-4 , Chap-5 ,Chap-6 ,Chap-7 ,Chap-8 ,Chap-9 ,Chap-10 ,Chap-11 ,Chap-12 ,Chap-13 ,Chap-14, Chap-15
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