Question 1195754
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It is the binomial distribution type problem.


<pre>
(A)  P = {{{C[4]^3*0.5^3*0.5}}} = {{{3*0.5^4}}} = {{{3/16}}} = 0.1875 = 18.75%.    <U>ANSWER</U>



(B)  P = {{{0.5^4}}} = {{{1/16}}} = 0.0625 = 6.25%.    <U>ANSWER</U>
</pre>

Solved.