Question

33. Calculate the anthmetic mean from the following data using
A Direct Method
B. Assumed Mean Method
X 5 10 15 20 25 30 35 40


f
5
7
9
10
8
6
5 last 2​

Answer 1

Answer:

x f fx

5 4 20

10 5 50

15 7 105

20 4 80

25 3 75

30 2 60

Total N=25 ∑fx=390

Arithmetic Mean,

x

ˉ

=

N

∑fx

=

25

390

=15.6

Answer 2

Answer:

Explanation:

x f fx

5 4 20

10 5 50

15 7 105

20 4 80

25 3 75

30 2 60

Total N=25 ∑fx=390

Arithmetic Mean,  

x

ˉ

=  

N

∑fx

​  

 

=  

25

390

​  

=1