Once an individual has been infected with a certain disease, let
xrepresent the time (days) that elapses before the individual becomes infectious. An article proposes a Weibull distribution with
\alpha =2.9,\beta =1.1, and
\gamma =0.5. [Hint: The two-parameter Weibull distribution can be generalized by introducing a third parameter
\gamma , called a threshold or location parameter: replace
xin the equation below,
f(x;\alpha ,\beta )={((\alpha )/(\beta ^(\alpha ))x^(\alpha -1)e^(-((x)/(\beta ))^(\alpha )),x>=0),(0,x<0):}by
x-\gamma and
x>=0by
x>=\gamma .] (a) Calculate
P(x>1.5)x