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k Probability Distribution Calculation and Graphing
You can calculate and graph probability distributions for single-variable statistics.
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uProbability distribution calculations
Use the RUN Mode to perform probability distribution calculations. Press K in
the RUN Mode to display the option number and then press 6 (g) 3 (PROB)
6 (g) to display a function menu, which contains the following items.
•{P(}/{Q(}/{R(} ... obtains probability {P(
t)}/{Q(t)}/{R(t)} value
•{t(} ... {obtains normalized variate t(x) value}
• Probability P(t), Q(t), and R(t), and normalized variate t(x) are calculated using
the following formulas.
P(t)Q(t)R(t)
Example The following table shows the results of measurements of the
height of 20 college students. Determine what percentage of
the students fall in the range 160.5 cm to 175.5 cm. Also, in
what percentile does the 175.5 cm tall student fall?
Class no. Height (cm) Frequency
1 158.5 1
2 160.5 1
3 163.3 2
4 167.5 2
5 170.2 3
6 173.3 4
7 175.5 2
8 178.6 2
9 180.4 2
10 186.7 1
1. In the STAT Mode, input the height data into List 1 and the frequency data into
List 2.
18 - 5 Performing Statistical Calculations
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