HP 33S User Manual page 6

hp calculators
HP 33S Normal distribution applications
In RPN mode: tS15¥4¥
Now execute label I and enter the value for Q(x). Note that the previous value computed for Q(x) is
displayed at the prompt.
In RPN mode: tI
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: 0Ë25¥
In RPN mode: tI
In RPN mode: 0Ë75¥
The values of x are –0.6745 and +0.6745. These are the number of standard deviations above and below
the average, between which 50% of the adjusters would be expected to be performing. To translate these
values of x into actual claims processed per hour. We will need to add 0.6745 standard deviations to the
average and also subtract 0.6745 standard deviations from the average.
In RPN mode: 0Ë6745Ï4¸15Ù
hp calculators - 6 - HP 33S Normal distribution applications - Version 1.0
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