Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_222448_1 (percent_defective VARCHAR, sigma__with_15σ_shift_ VARCHAR)
### Question:
When sigma (with 1.5σ shift) is 2.5, what percent is defective?
### Answer:
SELECT percent_defective FROM table_222448_1 WHERE sigma__with_15σ_shift_ = "2.5"