=+75. The bursting strength of wine bottles of a certain type is normally distributed with parameters  5 250 psi and  5 30 psi. If these bottles are shipped 12 to a carton, in what proportion of cartons will at least one of the bottles have a bursting strength exceeding 300 psi? Hint: Think of a bottle as a success S if its bursting strength exceeds 300 psi.