Question

17. Find out arithmetic mean using step deviation method from the following
data:
Marks: 25-35
No. of 8
students
35-45
12
45-55
6
55-65
14
65-75
7
75-85
3
​

Answer 1

Answer:

fhfhbcjgsfsjjshrysluheljjsfajfjesjtsfaharhqg has kdsfjsfhwfhfwysjsglsfj2u42rqdtjwtei

Step-by-step explanation:

tqhdxbahkotdlydlyzf5ll5

Answer 2

Step-by-step explanation:

Class Frequency

f

i

Mid−value

x

i

f

i

x

i

25−35 6 30 180

35−45 10 40 400

45−55 8 50 400

55−65 12 60 720

65−75 4 70 280

∑f

i

=40 ∑f

i

x

i

=1980

⇒

x

=

∑f

i

∑f

i

x

i

=

40

1980

=49.5