Question

Calculate Mean 44,45,30,36,44​

Answer 1

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The mean, or average, is calculated by adding up the scores and dividing the total by the number of scores. Consider the following number set: 3, 4, 6, 6, 8, 9, 11.

Answer 2

Step-by-step explanation:

Students of Class XI secured following marks in their Statistics paper.

Calculate arithmetic mean using Direct Method and Short-cut Method.

20, 44, 65, 28, 45, 67, 30, 50, 68, 39, 53, 70, 40, 60, 75

ANSWER:

Sr. No. Marks

(X) Deviation from the Assumed mean

d = X − A where A = 50

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15. 20

44

65

28

45

67

30

50 (A)

68

39

53

70

40

60

75 -30

-06

15

-22

-05

17

-20

0

18

-11

3

20

-10

10

25

N = 15 ΣX = 754 Σd = -104 + 108 = 4

where,

N= Number of items

ΣX= Total of monthly income of all the families

Σd= net sum of deviations

Calculation of Mean by direct method

X=ΣXNor, X¯¯¯=75415or, X¯¯¯=50.27⇒X¯¯¯ =50.27

Calculation of mean by short cut method

X=A+ΣdNor, X=50+415or, X=50+0.27=50.27⇒X=50.27

So, mean marks in statistics is 50.27

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