Generate single random digit

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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"? 

Reference no: EM133905946

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