R.QWEIBULL(p,shape,scale,lower_tail,log_p)
p: probability
shape: the shape parameter of the distribution
scale: the scale parameter of the distribution
lower_tail: if true (the default), the lower tail of the distribution is considered
log_p: if true, log of the probability is used
This function returns the probability quantile function, i.e., the inverse of the cumulative distribution function, of the Weibull distribution.