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goosegoblin:

madamelucretia:

hello-kitty-senpai:

Heres the thing you gotta understand about statistics. 

“Increases your chances by 80%” does not mean “there is now an 80% chance”. 

If your chances were previously 10%, your chances are now 18%, not 90%. 

if your chances were roughly 1%, they’re now just slightly less than 2%. 

thats how that works. 

… Ummm… I don’t understand.. If your previous chance was 10% and you do something to raise that chance by 80% wouldn’t your chances be 90%?

No, because percentages aren’t absolutes. If you raise 10% by 80%, that means you are increasing your end number by 80% of 10%. As a result, it goes up to 18%.

Let me try and use an example to illustrate:

A bag of crisps weighs 30g. The company decide to increase the size of the bag by 50%. This doesn’t mean the bag now weighs 80g- it means it increases by 50% of 30, which is 15. As a result, the bag now weighs 45g.

It’s the exact same here, except the first number is a percentage too! For example, let’s say I tell you I’ll give you 20% of my pizza. I then decide, being generous, that I’ll increase how much I give you by 50%. I’m giving you what I was originally giving you, plus half of what I was originally giving you. I’m not offering you 70%, I’m offering you 30%.

I hope that makes sense!

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