Question

find mean of the following data by deviation method
wagesis in rupees =12000,12500, 13000 ,13500 ,14000
number of employees= 7 ,12, 15, 10 ,7​

Answer 1

Step-by-step explanation:

Consider the following table, to calculate mean by "step deviation method":

x

i

=mid value of class interval

Assumed mean a=35

class interval c=10

ci f

i

x

i

u

i

=

c

x

i

−a

f

i

u

i

0−10 15 5 −3 −45

10−20 10 15 −2 −20

20−30 15 25 −1 −15

30−40 20 35 0 0

40−50 25 45 1 25

50−60 30 55 2 60

60−70 35 65 3 105

N=Σf

i

=150

Σf

i

u

i

=110

Mean

x

=a+

N

Σf

i

u

i

×c

∴

x

=35+

150

110

×10=42.3334≈42

Hence, option B is correct.

Answered By

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