percentages on a calculator?

phatus1010 · 2011-03-27 03:00:58

Hi

Just a quick question. If i were to flip a coin twice the chance of getting a head at least once would be 75%. I want to know how to calculate this on my calculator?

thx

bobbym · 2011-03-27 03:06:50

Hi phatus1010;

Welcome to the forum.

The problem really is too simple for a calculator. You just say the probability of getting no heads ( TT ) is ( 1 / 2 ) * ( 1 / 2 ) = 1 / 4. Now just subtract that from one. 1 - ( 1 / 4 ) is ( 3 / 4 ).

phatus1010 · 2011-03-27 03:43:34

Thanks for the response. Yes that's how i was calculating it myself. I was actually trying to work out the percentage chance of 0.9% occuring at least once over 9 attempts. I typed in 0.991 x 0.991 nine times then subtracted the answer from 1. This seemed really time consuming so i tried to use the percentage button which i couldn't get to work. Not sure if there's an easier way of working this calculation out?

Last edited by phatus1010 (2011-03-27 03:43:56)

bobbym · 2011-03-27 03:56:16

Hi;

Do you have a power key?

phatus1010 · 2011-03-27 06:15:05

bobbym wrote:

Hi;
Do you have a power key?

Ah okay. I don't have one on my computer desktop calcultor but at least i know how to do it now.

Thanks

bobbym · 2011-03-27 08:16:33

Hi phatus1010;

Your welcome, let me know how you did.

Math Is Fun Forum

#1 2011-03-27 03:00:58

percentages on a calculator?

#2 2011-03-27 03:06:50

Re: percentages on a calculator?

#3 2011-03-27 03:43:34

Re: percentages on a calculator?

#4 2011-03-27 03:56:16

Re: percentages on a calculator?

#5 2011-03-27 06:15:05

Re: percentages on a calculator?

#6 2011-03-27 08:16:33

Re: percentages on a calculator?

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