HP 33S - Page 4

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HP 33S Probability – Rearranging items
Figure 5
where P(X) is the probability of having X successes observed, nCx is the combination of n items
taken x at a time, and p is the probability of a success on each trial.
In RPN mode: 10Ï4¹x0Ë5Ï4)¸
1Ï0Ë5Ã10Ï4Ã)¸
In algebraic mode: 10¹x4¸0Ë5)4¸ºy1Ã0Ë5
º|)ºy10Ã4º|Ï
Figure 6
Answer: If you flip a coin 10 times, there is a 20.51% chance of seeing heads 4 times. Figure 6 indicates the
display if solved in algebraic mode.
hp calculators - 4 - HP 33S Probability – Rearranging items - Version 1.0