HP 35s Instruction Manual page 4

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HP 35s Probability – Rearranging items
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:
In algebraic mode: ¹x10Õ4Õ¸0Ë5)4¸41Ã0Ë5
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.
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10Ï4¹x0Ë5Ï4)¸
1Ï0Ë5Ã10Ï4Ã)¸
Õ)410Ã4Ï
Figure 6
- 4 - HP 35s Probability – Rearranging items - Version 1.0
Figure 5