The following MINITAB output exhibits the cumulative distribution function curves of three lognormal distributions. Their mean and variance, respectively, are (1, .5), (1, 1), and (1, 2). Compare the three cumulative distribution curves indicated in the figure.

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MTB SET C1 DATA 0:10/0.1 DATA END MTB > CDF C1 C2; SUBC> LOGNORMAL 1.05. MTB > CDF C1 C3; SUBC LOGNORMAL 1 1. MTB > CDF C1 C4; SUBC> LOGNORMAL 1 2. MTB > GPRO * NOTE * Professional Graphics are enabled. Standard Graphics are disabled. Use the GSTD command to enable Standard Graphics. MTB > Plot C2*C1 C3 *C1 C4 *C1; SUBC> Connect; SUBC Type 1; SUBC> Color 1; SUBC> Size 1; SUBC> Overlay; SUBC> Axis 1; SUBC> Label "x"; SUBC> Axis 2; SUBC> Label "f(x) ".