Question

Q. 1. The following distribution gives the pattern
of overtime work per month done by 180 employees
of a company. Calculate the arithmetic mean.
Overtime
(in hrs.)
0-10
10-30
30-40
40-50
50-60
No. of Employees
10
60
50
40
20​

Answer 1

Answer:

32.78

Explanation:

x                  f               m         fm  

(1)                (2)            (3)        (4)

0-10            10             5           50

10-30          60            20        1200

30-40         50            35         1750

40-50         40            45         1800

50-60         20            55         1100

Sigma(f)=   180  Sigma(fm)=    5900

MEAN:

Sigma(fm)/Sigma(f)

= 5900/180

=32.78