Need help sir/maam.

I do have a data with age. N= 10

Age----Count

5------3

10-----2

15-----5

How to compute the averages of a count? (formula) (Nod)

Average shld be = 11

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- Mar 28th 2011, 07:49 PMranthraveSimple Averages
Need help sir/maam.

I do have a data with age. N= 10

Age----Count

5------3

10-----2

15-----5

How to compute the averages of a count? (formula) (Nod)

Average shld be = 11 - Mar 28th 2011, 07:55 PMTheChaz
5 + 5 + 5 (<--- 3 times) + 10 + 10 (<-- 2 times) + 15 + 15 + 15 + 15 + 15 (<-- 5 times) = 110

110/10 = 11 - Mar 28th 2011, 08:01 PMranthrave
Is there any other way? I do have a large set of data (age) And I need a simple formula..

- Mar 28th 2011, 08:03 PMTheChaz
There might be... it's been a while since I've had to learn such things.

Rather than having ___ + ___ + ___ + ___ + ...

you could multiply (using your numbers) 5*3 + 10*2 + 15*5 - Mar 28th 2011, 08:05 PMSambit
A simpler way: $\displaystyle \frac{(5*3)+(10*2)+(15*5)}{(5+3+2)} = 11$