What is the weighted average?

if a=50%,b=25%,c=20%,d=5%.

Value of a=136.5/255,

b = 75/75

c =19/20

d = 30/30.

I keep getting different answers. Can someone explain the right way to do this?

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- July 5th 2012, 02:35 PMkadsWeighted Averages
**What is the weighted average?**

if a=50%,b=25%,c=20%,d=5%.

Value of a=136.5/255,

b = 75/75

c =19/20

d = 30/30.

I keep getting different answers. Can someone explain the right way to do this? - July 5th 2012, 02:48 PMPlatoRe: Weighted Averages
- July 5th 2012, 05:14 PMHallsofIvyRe: Weighted Averages
What do "136.5/255", "75/75", "19/20", and "30/30"

**mean**? If they are not simply fractions, which does not seem likely, what I don't know what you mean. Further, you are confusing things by using the same letters, "a", "b", "c", and "d" for both them an their respective weights.

**If**you had four NUMBERS, A, B, C, and D, with "weights" 50%, 25%, 20%, 5%, respectively, then the "weighted average" would be .5A+ .25B+ .2C+ .05D. - July 6th 2012, 10:35 AMWilmerRe: Weighted Averages