Hi,
I am fitting a weibull model as follows 
my models is

s <- Surv(DFBR$Time,DFBR$Censor)

wei <- survreg(s~Group+UsefulLife,data = DFBR,dist="weibull")



How can i predict the probabilty of failure in next 10 days, for a new data with group =10 and usefuleLife =100 
Thx
shilpi  		 	   		  
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