Question

find the mean of the following frequency distribution by step deviation method?​

Answer 1

Step-by-step explanation:

Class interval width (i) = 10

Converting the given data into frequency distribution table

Class interval X No. of employees

F u=iX−A

Fu 11-21 16 2 -2 -4 21-31 26 4 -1 -4 31-41 36=A 6 0 0 41-51 46 8  18 51-61 56  10 220   Σf=30  Σfu=20 

Mean = A+ΣfΣfu=36+3020×10=36+6.66=42.66

hope it works