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What is the probability that Fatima gets fewer heads than tails if she flips 10 coins?

 Dec 31, 2018
 #1
avatar+95171 
+2

The  prob of gettint exactly 5 heads is 10C5 (0.5)^10 = 252/1024 = 63/256

So it seems logical that the prob of not getting 5 heads is 1-63/256 = 193/256

and hall of those would have fewer heads than tails

 

(193/256) /2 = 193/512

 Dec 31, 2018
 #2
avatar+3576 
+3

This is the correct answer which can be seen by evaluating

 

\(\sum \limits_{k=0}^4~\dbinom{10}{k}\left(\dfrac 1 2\right)^{10}= \dfrac{193}{512}\)

Rom  Dec 31, 2018

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