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# A fair coin with sides marked heads and tails is to be

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Intern
Joined: 03 Apr 2006
Posts: 44

Kudos [?]: 27 [0], given: 0

A fair coin with sides marked heads and tails is to be [#permalink]

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09 Jun 2007, 15:33
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A fair coin with sides marked heads and tails is to be tossed eight times. What is the probability that the coin will land tails side up more than five times?

a) 37/256
b) 45/256
c)23/256
d) 70/ 256
e) 81/ 256

Kudos [?]: 27 [0], given: 0

Director
Joined: 13 Mar 2007
Posts: 541

Kudos [?]: 94 [0], given: 0

Schools: MIT Sloan

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09 Jun 2007, 15:53
(A)

t>5

i.e t = 6 or 7 or 8

prob(t=6) = 8C6 (1/2)^8

prob(t=7) = 8C7 (1/2)^8

prob(t=8) = 1

= 37/256

Kudos [?]: 94 [0], given: 0

09 Jun 2007, 15:53
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# A fair coin with sides marked heads and tails is to be

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