Using a function on her calculator, Julie can generate a single random digit by pressing the "Enter" key. She wants to experiment and see how many times it will take for her calculator to generate a third "7." Assume that the calculator will generate a "7" on any given attempt with probability 0.15. How many non-"7" digits should we expect to precede the third "7"? (Answer as a decimal number. Round to three decimal places, as needed.)