Hi i am new in this fourm.

any one help me in this .....

Please...

a) In which situations weighted mean and arithmetic mean are used.

b) From the following data, find the weighted mean.

Items

Food

House rent

Clothing

Fuel & electricity

Education

Miscellaneous

Expenditure Rs.

3000

600

200

150

100

50

Weights

20

8

5

4

2

1