document.write( "Question 1181566: Find the indicated probabilities using the geometric​ distribution, the Poisson​ distribution, or the binomial distribution. Then determine if the events are unusual. If​ convenient, use the appropriate probability table or technology to find the probabilities.
\n" ); document.write( "Assume the probability that you will make a sale on any given telephone call is 0.13. Find the probability that you​ (a) make your first sale on the fifth​ call, (b) make your sale on the​ first, second, or third​ call, and​ (c) do not make a sale on the first three calls. \n" ); document.write( "
Algebra.Com's Answer #811477 by greenestamps(13203)\"\" \"About 
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\n" ); document.write( "The responses from the other tutor are correct for parts (a) and (c).

\n" ); document.write( "For part (b), the statement of the problem is that we are to find the probability that we \"make our sale on the first, second, or third​ call\".

\n" ); document.write( "That statement is logically nonsense. The \"or\" indicates we are talking about a particular call; but the \"first, second, or third...\" indicates we are talking about one of three calls.

\n" ); document.write( "To make sense, part (b) should ask for the probability that the FIRST sale is made on the first, second, or third call.

\n" ); document.write( "But since that is not what the problem (as you show it) asks for; we can't know what probability they are really asking for. But it definitely does not mean what the other tutor interpreted it as -- making sales on ALL THREE of the first three calls.
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