document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=956993>Question 956993</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A popular morning radio show offers free entrance tickets to the local boat show to the sixth caller who rings the station with the correct answer to a question. Assume that all calls are independent and have probability p = 0.7 of being correct. Let X be the random variable that counts the number of calls needed to find the winner.\r<BR>\n" );
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document.write( "Questions:<BR>\n" );
document.write( "(a)  What is the probability mass function of X?<BR>\n" );
document.write( "(b)  What is the probability of &#64257;nding a winner on the 12th call?<BR>\n" );
document.write( "(c)  What is the probability that it will take more than ten calls to &#64257;nd a winner? </SPAN>\n" );
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