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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)  

Calculate the standard deviation.

Natural numbers are 42,36,33,29,21,26,33

 



Answer:_______________




2)  

Calculate the standard deviation.

Natural numbers are 43,39,32,31,24,27,32

 



Answer:_______________




3)  

Calculate the standard deviation.

Natural numbers are 43,37,34,29,24,26,34

 



Answer:_______________




4)  

Calculate the standard deviation.

Natural numbers are 41,37,35,29,24,26,35

 



Answer:_______________




5)  

Calculate the standard deviation.

Natural numbers are 42,38,32,31,25,26,32

 



Answer:_______________




6)  

Calculate the standard deviation.

Natural numbers are 40,37,35,29,21,26,35

 



Answer:_______________




7)  

Calculate the standard deviation.

Natural numbers are 41,36,35,30,25,26,35

 



Answer:_______________




8)  

Calculate the standard deviation.

Natural numbers are 44,38,35,31,20,28,35

 



Answer:_______________




9)  

Calculate the standard deviation.

Natural numbers are 41,36,33,31,22,26,33

 



Answer:_______________




10)  

Calculate the standard deviation.

Natural numbers are 44,36,35,29,23,27,35

 



Answer:_______________




 

1)  

Calculate the standard deviation.

Natural numbers are 42,36,33,29,21,26,33

  Answer: 6.34


SOLUTION 1 :

Assumed Mean Method

Let us take A = 33 as assumed mean and form the following table.

x

d = x- 33

d2

21

26

29

33

33

36

42

 

 -12

-7

-4

0

0

3

9

 

144

49

16

0

0

9

81

 

  ∑d= -11 ∑d2 = 299

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2997)  -    (-117 )2

=   (42.71 - (-1.57)2)

=   (42.71-2.46)

=   40.25

standard deviation Ô = 6.34

 



2)  

Calculate the standard deviation.

Natural numbers are 43,39,32,31,24,27,32

  Answer: 6.07


SOLUTION 1 :

Assumed Mean Method

Let us take A = 32 as assumed mean and form the following table.

x

d = x- 32

d2

24

27

31

32

32

39

43

 

 -8

-5

-1

0

0

7

11

 

64

25

1

0

0

49

121

 

  ∑d= 4 ∑d2 = 260

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2607)  -    (47 )2

=   (37.14 - (0.57)2)

=   (37.14-0.32)

=   36.82

standard deviation Ô = 6.07

 



3)  

Calculate the standard deviation.

Natural numbers are 43,37,34,29,24,26,34

  Answer: 6.12


SOLUTION 1 :

Assumed Mean Method

Let us take A = 34 as assumed mean and form the following table.

x

d = x- 34

d2

24

26

29

34

34

37

43

 

 -10

-8

-5

0

0

3

9

 

100

64

25

0

0

9

81

 

  ∑d= -11 ∑d2 = 279

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2797)  -    (-117 )2

=   (39.86 - (-1.57)2)

=   (39.86-2.46)

=   37.40

standard deviation Ô = 6.12

 



4)  

Calculate the standard deviation.

Natural numbers are 41,37,35,29,24,26,35

  Answer: 5.75


SOLUTION 1 :

Assumed Mean Method

Let us take A = 35 as assumed mean and form the following table.

x

d = x- 35

d2

24

26

29

35

35

37

41

 

 -11

-9

-6

0

0

2

6

 

121

81

36

0

0

4

36

 

  ∑d= -18 ∑d2 = 278

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2787)  -    (-187 )2

=   (39.71 - (-2.57)2)

=   (39.71-6.60)

=   33.11

standard deviation Ô = 5.75

 



5)  

Calculate the standard deviation.

Natural numbers are 42,38,32,31,25,26,32

  Answer: 5.62


SOLUTION 1 :

Assumed Mean Method

Let us take A = 32 as assumed mean and form the following table.

x

d = x- 32

d2

25

26

31

32

32

38

42

 

 -7

-6

-1

0

0

6

10

 

49

36

1

0

0

36

100

 

  ∑d= 2 ∑d2 = 222

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2227)  -    (27 )2

=   (31.71 - (0.29)2)

=   (31.71-0.08)

=   31.63

standard deviation Ô = 5.62

 



6)  

Calculate the standard deviation.

Natural numbers are 40,37,35,29,21,26,35

  Answer: 6.24


SOLUTION 1 :

Assumed Mean Method

Let us take A = 35 as assumed mean and form the following table.

x

d = x- 35

d2

21

26

29

35

35

37

40

 

 -14

-9

-6

0

0

2

5

 

196

81

36

0

0

4

25

 

  ∑d= -22 ∑d2 = 342

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (3427)  -    (-227 )2

=   (48.86 - (-3.14)2)

=   (48.86-9.86)

=   39.00

standard deviation Ô = 6.24

 



7)  

Calculate the standard deviation.

Natural numbers are 41,36,35,30,25,26,35

  Answer: 5.37


SOLUTION 1 :

Assumed Mean Method

Let us take A = 35 as assumed mean and form the following table.

x

d = x- 35

d2

25

26

30

35

35

36

41

 

 -10

-9

-5

0

0

1

6

 

100

81

25

0

0

1

36

 

  ∑d= -17 ∑d2 = 243

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2437)  -    (-177 )2

=   (34.71 - (-2.43)2)

=   (34.71-5.90)

=   28.81

standard deviation Ô = 5.37

 



8)  

Calculate the standard deviation.

Natural numbers are 44,38,35,31,20,28,35

  Answer: 7.09


SOLUTION 1 :

Assumed Mean Method

Let us take A = 35 as assumed mean and form the following table.

x

d = x- 35

d2

20

28

31

35

35

38

44

 

 -15

-7

-4

0

0

3

9

 

225

49

16

0

0

9

81

 

  ∑d= -14 ∑d2 = 380

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (3807)  -    (-147 )2

=   (54.29 - (-2.00)2)

=   (54.29-4.00)

=   50.29

standard deviation Ô = 7.09

 



9)  

Calculate the standard deviation.

Natural numbers are 41,36,33,31,22,26,33

  Answer: 5.80


SOLUTION 1 :

Assumed Mean Method

Let us take A = 33 as assumed mean and form the following table.

x

d = x- 33

d2

22

26

31

33

33

36

41

 

 -11

-7

-2

0

0

3

8

 

121

49

4

0

0

9

64

 

  ∑d= -9 ∑d2 = 247

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (2477)  -    (-97 )2

=   (35.29 - (-1.29)2)

=   (35.29-1.66)

=   33.63

standard deviation Ô = 5.80

 



10)  

Calculate the standard deviation.

Natural numbers are 44,36,35,29,23,27,35

  Answer: 6.43


SOLUTION 1 :

Assumed Mean Method

Let us take A = 35 as assumed mean and form the following table.

x

d = x- 35

d2

23

27

29

35

35

36

44

 

 -12

-8

-6

0

0

1

9

 

144

64

36

0

0

1

81

 

  ∑d= -16 ∑d2 = 326

 

 Here, n = 7

standard deviation Ô=  ∑d2 
-
 
  (∑d)2
  n  n2

 

 =     (3267)  -    (-167 )2

=   (46.57 - (-2.29)2)

=   (46.57-5.24)

=   41.33

standard deviation Ô = 6.43