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214                    Fundamentals of Probability and Statistics for Engineers


                         f (x)
                         X
                       2.0




                       1.5


                               η =3, λ=5
                       1.0



                       0.5        η =3, λ=3
                                             η =3, λ=1

                       0.0                                      x
                         0.0     1.5     3.0      4.5     6.0
                          (a)


                         f (x)
                         X
                       2.0



                       1.5

                            η =0.5, λ=1

                       1.0



                       0.5     η =1, λ=1

                                                η =3, λ=1
                       0.0                                      x
                         0.0     1.5     3.0     4.5      6.0
                         (b)
            Figure 7.10 Gamma distribution with: (a)   ˆ  3 and   ˆ  5,   ˆ  3, and   ˆ  1, and
                             (b)   ˆ  1 and   ˆ :  1, and   ˆ  3
                                           0 5,   ˆ







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