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31 August, 16:23

You are expecting a call from a friend anytime between 3:00 P. M. and 5:00 P. M. At 3:20 P. M, you discover that someone accidentally left the phone off the hook. What is the probability that you missed your friend's call?

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  1. 31 August, 16:24
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    The probability that you missed the call is 20/120 (1/6) because the time in which you expect the call is 2 hours (120 minutes), and the time that you missed is 20 minutes. So 20 out of 120 is 20/120, or 1/6 or 16.6666667%.
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