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Class 11th

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New answer posted

6 months ago

Class 11th Statistics

Class 11 Maths Statistics exercise 13.3 Solution

23. From the data given below state which group is more variable, A or B?

Marks

10-20

20-30

30-40

40-50

50-60

60-70

70-80

Group A

9

17

32

33

40

10

9

Group B

10

20

30

25

43

15

7
0 Follower 15 Views

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Payal Gupta

Contributor-Level 10

23. Let the assumed mean be A=45 and h=10. Then we can tabulate the given data as following.

=−6150*10+45.

= 44.6

New question posted

6 months ago

Class 11th Statistics

Class 11 Maths Statistics exercise 13.3 Solution

23. From the data given below state which group is more variable, A or B?
0 Follower 10 Views

New answer posted

6 months ago

Class 11th Statistics

22. The diameters of circles (in mm) drawn in a design are given below:

Diameters

33-36

37-40

41-44

45-48

49-52

No. of circles

15

17

21

22

25

Calculate the standard deviation and mean diameter of the circles.

[ Hint First make the data continuous by making the classes as 32.5-36.5, 36.5-40.5, 40.5-44.5, 44.5 - 48.5, 48.5 - 52.5 and then proceed.]
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

22. The given data is converted into continuous frequency duration by subtracting and adding 0.5 from lower and upper limit respectively. Lit the assumed mean be A=42.5 and h=4

New answer posted

6 months ago

Class 11th Statistics

21. Find the mean, variance and standard deviation using short-cut method

Height in cms

70-75

75-80

80-85

85-90

90-95

95-100

100-125

105-110

110-115

Frequencies

3

4

7

7

15

9

6

6

3
0 Follower 3 Views

P
Payal Gupta

Contributor-Level 10

21. Let the assumed mean be A=92.5 and h=5

New answer posted

6 months ago

Class 11th Statistics

20. 

Classes

0-10

10-20

20-30

30-40

40-50

Frequencies

5

8

15

16

6
0 Follower 8 Views

P
Payal Gupta

Contributor-Level 10

20.

We have,  N=∑i=1nfi=50 .

So, mean,  x¯=1N*∑i=1nfi xi=13505=27.

=150*6600

= 132.

New answer posted

6 months ago

Class 11th Statistics

19. Find the mean and variance for the following frequency distributions in Exercises 19 and 20.

Classes

0-30

30-60

60-90

90-120

120-150

150-180

180-210

Frequencies

2

3

5

10

3

5

2
0 Follower 2 Views

P
Payal Gupta

Contributor-Level 10

19. Let the assumed mean be A=105 and class width, h=30. The given data can be tabulated as

= 2280 - 4

= 2276.

New question posted

6 months ago

Class 11th Statistics

19. Find the mean and variance for the following frequency distributions in Exercises 19 and 20.
0 Follower 1 View

New answer posted

6 months ago

Class 11th Statistics

18.Find the mean and standard deviation using short-cut method.

xi

60

61

62

63

64

65

66

67

68

fi

2

1

12

29

25

12

10

4

5
0 Follower 8 Views

P
Payal Gupta

Contributor-Level 10

18. Let the assumed mean be A=64 and it the width, h=1.

New answer posted

6 months ago

Class 11th Statistics

17. 

xi

92

93

97

98

102

104

109

fi

3

2

3

2

6

3

3
0 Follower 16 Views

P
Payal Gupta

Contributor-Level 10

17. The given data can be tabulated as follow

New answer posted

6 months ago

Class 11th Statistics

16. 

xi

6

10

14

18

24

28

30

fi

2

4

 7

12

8

4

3
0 Follower 1 View

P
Payal Gupta

Contributor-Level 10

16. The given data can be tabulated as follow.

 

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