HP 35s User Manual page 6

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HP 35s Normal distribution applications
We're looking for a range within which 50% of the probability falls that is evenly spread around the average.
Since the normal distribution is symmetrical, this means that 25% would be below the mean and 25%
would be above the mean. The input values for Q(x), however, are upper tail probabilities. This means the
values of Q(x) that need to be input will be 0.75 and 0.25.
In RPN mode:
In RPN mode:
Answer: The middle 50% of the adjusters would average processing between 12.3020 and 17.6980 claims per hour.
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Figure 14
Figure 15
HP 35s Normal distribution applications - Version 1.0