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256 Fundamentals of Probability and Statistics for Engineers
40
Number of observations 30
20
10
0
2250 2500 2750 3000 3250
Peak combustion pressure (kPa)
Figure 8.4 Histogram for Problem 8.2(h) (source: Chen and Krieger, 1976)
50
Percentage of drivers in group 30 Low-risk drivers
40
Medium-risk drivers
High-risk drivers
20
10
0 40 80 120 160 200 240 280
Annual premium ($)
Figure 8.5 Frequency diagrams for Problem 8.2(i) (source: Ferreira, 1974)
observed and computed urinary digitoxin excretion in micrograms per day
is given in Figure 8.7 (n 100) (source: Jelliffe et al., 1970).
(l) X is the live load in pounds per square feet (psf) in warehouses. The
histogram in Figure 8.8 represents 220 measurements of live loads on
different floors of a warehouse over bays of areas of approximately 400
square feet (source: Dunham, 1952).
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