The pass rate of a factory's products is 95%, and 100 of them are spot-checked, and no substandard is found. Which of the following is correct:. [' Sampling again, there may be 7 failures.', ' The qualification rate of this product should be 100%.', ' Then the next spot-check must be 10 unqualified.', ' The qualification rate of this product should be greater than 95%.']