Suppose that 100 customers of an online retailer were asked in an email survey whether they preferred free 3-day shipping or whether they preferred overnight shipping for $4.99. 70% said that they preferred free 3-day shipping. 65% of the customers were male. 80% of the males preferred free 3-day shipping.

Suppose a randomly selected customer prefers free 3-day shipping. What is the probability the customer is a female? Please enter your answer as a decimal rounded to 2 decimals. That is, if your answer is 50%, enter 0.50.