Question

calculate Arithmetic mean of the following series take 15 and assumed mean and u shortcut method​

Answer 1

Answer:

Answer:- Using Shortcut method

Class Interval  x  Frequency

f  d=x-A  fd  

10-15  13  7  -4  -28  

15-20  17=A   12  0 0  

20-25  23  8  6  48  

25-30  27   10 10  100  

   Σf=37    Σfd=120  

Mean = A+  

Σf

Σfd

​

=17+  

37

120

​

=17+3.337=20.337

C)20.337

Explanation: