Fundamentals of Probability and Statistics for Engineers

Number of observations

6000

4000

2000

0

0123456

Number of accidents in six years

Figure 8.2 H istogram from six-year accident data (data source: Burg, 1967, 1968)

100

80

60

40

20

Number of observations

0

64 67 70 73

Percentage yield

76

Figure 8.3 H istogram for percentage yield with four intervals (data source:H ill, 1975)

Observed Data and Graphical Representation 251