Question 1132047
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(a)  &nbsp;&nbsp;<U>What is the probability of not getting a head?</U>


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     {{{(1/2)^10}}} = {{{1/2^10}}} = {{{1/1024}}}.       <U>ANSWER</U>


     By the way, it is <U>THE SAME probability</U> as of <U>not getting a tail</U> (!)
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(b)  &nbsp;&nbsp;<U>What is the probability of getting a head at least 2 times</U>


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     The probability of getting a head at least 2 times is the COMPLEMENT to getting  a head not more than 1 time and is equal to


     1 - {{{((1/2)^10 + C[10]^1*(1/2)*(1/2)^9)}}} = 1 - {{{((1/2)^10 + 10*(1/2)^10)}}} = 0.9893 = 98.93%.     <U>ANSWER</U>
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