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Need Help....Summary / Average of subsets


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Hi... amateur of FM here.

Trying to design a database

Let's say if we were trying to find the average age of car of different colours let's say for example sake.... how can you calculate the for example the average age of red cars....

so more precisely....

A database that has variable of age of car and colour of cars...

you have n numbers of red car and y numbers of blue cars and z number of green cars.. how can you summarise the data and find out the average age of each colours of car?

Thanks

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