Question

calculate arithmetic mean by assumed mean method sales( x) 0-10,10-20,20-30,30-40,40-50 no.of .firms (f) 10,20,30, 15, 5.​

Answer 1

Let the assumed mean be A=35

Marks Mid-value

(x) No. of students

(f) d=x−35 fd

0−10

10−20

20−30

30−40

40−50

50−60 5

15

25

35

45

55 5

10

25

30

20

10 −30

−20

−10

0

10

20 −150

−200

−250

0

200

200

∑f=100 ∑fd=−200

x

=A+

∑f

∑fd

=35+(

100

−200

)=35−2=33

Answer 2

Answer:

33 is the answer of this question