Scroll:statistics >> standard deviation >> saq (4238)

Written Instructions:

For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..

For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.

Leave your answers in the simplest form or correct to two decimal places.


 

1)  

 Using assumed mean method find the mean weight of 51 students using the data given below.

weight in kg 44 49 52 57 65
No. of students 17 14 10 6 4


 


Answer:_______________




2)  

 Using assumed mean method find the mean weight of 58 students using the data given below.

weight in kg 45 49 52 60 62
No. of students 17 16 13 8 4


 


Answer:_______________




3)  

 Using assumed mean method find the mean weight of 53 students using the data given below.

weight in kg 41 47 55 57 62
No. of students 17 14 10 7 5


 


Answer:_______________




4)  

 Using assumed mean method find the mean weight of 55 students using the data given below.

weight in kg 42 46 52 57 62
No. of students 17 15 10 8 5


 


Answer:_______________




5)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 43 48 51 60 63
No. of students 18 16 12 6 5


 


Answer:_______________




6)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 42 49 55 59 64
No. of students 18 14 12 8 5


 


Answer:_______________




7)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 45 50 52 60 64
No. of students 18 14 12 9 4


 


Answer:_______________




8)  

 Using assumed mean method find the mean weight of 54 students using the data given below.

weight in kg 41 48 53 59 65
No. of students 18 14 12 6 4


 


Answer:_______________




9)  

 Using assumed mean method find the mean weight of 52 students using the data given below.

weight in kg 41 47 54 60 62
No. of students 17 14 11 7 3


 


Answer:_______________




10)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 45 50 53 60 62
No. of students 17 14 13 8 5


 


Answer:_______________




 

1)  

 Using assumed mean method find the mean weight of 51 students using the data given below.

weight in kg 44 49 52 57 65
No. of students 17 14 10 6 4

Answer: 50.12

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

44

49

52=A

57

65

17

14

10

6

4

 -8

-3

0

5

13

-136

-42

0

30

52 

 51   -96

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
52
 
+
 		(-96)
(51)
 

 

= 52 + (-1.88)

= 50.12



2)  

 Using assumed mean method find the mean weight of 58 students using the data given below.

weight in kg 45 49 52 60 62
No. of students 17 16 13 8 4

Answer: 50.91

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

45

49

52=A

60

62

17

16

13

8

4

 -7

-3

0

8

10

-119

-48

0

64

40 

 58   -63

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
52
 
+
 		(-63)
(58)
 

 

= 52 + (-1.09)

= 50.91



3)  

 Using assumed mean method find the mean weight of 53 students using the data given below.

weight in kg 41 47 55 57 62
No. of students 17 14 10 7 5

Answer: 49.32

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

41

47

55=A

57

62

17

14

10

7

5

 -14

-8

0

2

7

-238

-112

0

14

35 

 53   -301

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
55
 
+
 		(-301)
(53)
 

 

= 55 + (-5.68)

= 49.32



4)  

 Using assumed mean method find the mean weight of 55 students using the data given below.

weight in kg 42 46 52 57 62
No. of students 17 15 10 8 5

Answer: 48.91

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

42

46

52=A

57

62

17

15

10

8

5

 -10

-6

0

5

10

-170

-90

0

40

50 

 55   -170

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
52
 
+
 		(-170)
(55)
 

 

= 52 + (-3.09)

= 48.91



5)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 43 48 51 60 63
No. of students 18 16 12 6 5

Answer: 49.63

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

43

48

51=A

60

63

18

16

12

6

5

 -8

-3

0

9

12

-144

-48

0

54

60 

 57   -78

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
51
 
+
 		(-78)
(57)
 

 

= 51 + (-1.37)

= 49.63



6)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 42 49 55 59 64
No. of students 18 14 12 8 5

Answer: 50.77

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

42

49

55=A

59

64

18

14

12

8

5

 -13

-6

0

4

9

-234

-84

0

32

45 

 57   -241

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
55
 
+
 		(-241)
(57)
 

 

= 55 + (-4.23)

= 50.77



7)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 45 50 52 60 64
No. of students 18 14 12 9 4

Answer: 51.40

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

45

50

52=A

60

64

18

14

12

9

4

 -7

-2

0

8

12

-126

-28

0

72

48 

 57   -34

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
52
 
+
 		(-34)
(57)
 

 

= 52 + (-0.60)

= 51.40



8)  

 Using assumed mean method find the mean weight of 54 students using the data given below.

weight in kg 41 48 53 59 65
No. of students 18 14 12 6 4

Answer: 49.26

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

41

48

53=A

59

65

18

14

12

6

4

 -12

-5

0

6

12

-216

-70

0

36

48 

 54   -202

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
53
 
+
 		(-202)
(54)
 

 

= 53 + (-3.74)

= 49.26



9)  

 Using assumed mean method find the mean weight of 52 students using the data given below.

weight in kg 41 47 54 60 62
No. of students 17 14 11 7 3

Answer: 49.13

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

41

47

54=A

60

62

17

14

11

7

3

 -13

-7

0

6

8

-221

-98

0

42

24 

 52   -253

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
54
 
+
 		(-253)
(52)
 

 

= 54 + (-4.87)

= 49.13



10)  

 Using assumed mean method find the mean weight of 57 students using the data given below.

weight in kg 45 50 53 60 62
No. of students 17 14 13 8 5

Answer: 51.65

 


SOLUTION 1 :

 

weights in kgf d = x-A fd

45

50

53=A

60

62

17

14

13

8

5

 -8

-3

0

7

9

-136

-42

0

56

45 

 57   -77

 

-
x
 
=
 
A
 
+
 		∑ fd
∑ f

 

-
x
 
=
 
53
 
+
 		(-77)
(57)
 

 

= 53 + (-1.35)

= 51.65