# Hint to Puzzle #38: Probability of Seeing a Car in 10 Minutes & 30 Minutes

38. On a deserted road, the probability of observing a car during a thirty-minute period is 95%. What is the chance of observing a car in a ten-minute period?

To clarify the question we are saying the probability of seeing any other cars in 30 minutes is 95% or more clearly, and more usefully, the probability of not seeing any other cars is 5%.

What is the probability of tossing a coin and getting 3 heads in a row?

What has to happen 3 times in a row in order that you do not see a car for 30 minutes?

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