Need help with a probability problem that is causing me some difficulty.

A coin is tossed 8 times. What is the probability of more than six tails?

Thanks.

garrett88

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- Apr 30th 2008, 09:11 AMgarrett88Probability - coin tosses
Need help with a probability problem that is causing me some difficulty.

A coin is tossed 8 times. What is the probability of more than six tails?

Thanks.

garrett88 - Apr 30th 2008, 09:18 AMKai
Hmm, probability to get a tail is 1/2( am assuming an unbiased coin is being used )

On one throw it is 1/2.

Probability to get more than 6 tails = prob to get 7 tail + prob to get 8 tail

Hopes it helps - Apr 30th 2008, 09:24 AMTheEmptySet
- Apr 30th 2008, 09:30 AMKai
- Apr 30th 2008, 01:11 PMTheEmptySet
Let H be heads and T be tails If you toss a coint eight times this is the possible ways you can get 1 head and 7 tails

{H,T,T,T,T,T,T,T}

{T,H,T,T,T,T,T,T}

{T,T,H,T,T,T,T,T}

{T,T,T,H,T,T,T,T}

{T,T,T,T,H,T,T,T}

{T,T,T,T,T,H,T,T}

{T,T,T,T,T,T,H,T}

{T,T,T,T,T,T,T,H}

There are a total of 8 ways

You could also use the formula for binomial prob

This gives the same answer.

I hope this clear it up. - Apr 30th 2008, 01:26 PMjanvdl